<?php
/**
 * ShippingApi
 * PHP version 7.2
 *
 * @category Class
 * @package  SellingPartnerApi
 */

/**
 * Selling Partner API for Shipping
 *
 * Provides programmatic access to Amazon Shipping APIs.
 *
 * The version of the OpenAPI document: v1
 * 
 * Generated by: https://openapi-generator.tech
 * OpenAPI Generator version: 5.0.1
 */

/**
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 */

namespace SellingPartnerApi\Api;

use GuzzleHttp\Client;
use GuzzleHttp\ClientInterface;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Psr7\MultipartStream;
use GuzzleHttp\Psr7\Request;
use GuzzleHttp\RequestOptions;
use SellingPartnerApi\ApiException;
use SellingPartnerApi\Configuration;
use SellingPartnerApi\HeaderSelector;
use SellingPartnerApi\ObjectSerializer;

/**
 * ShippingApi Class Doc Comment
 *
 * @category Class
 * @package  SellingPartnerApi
 */
class ShippingApi
{
    /**
     * @var ClientInterface
     */
    protected $client;

    /**
     * @var Configuration
     */
    protected $config;

    /**
     * @var HeaderSelector
     */
    protected $headerSelector;

    /**
     * @var int Host index
     */
    protected $hostIndex;

    /**
     * @param Configuration   $config
     * @param ClientInterface $client
     * @param HeaderSelector  $selector
     * @param int             $hostIndex (Optional) host index to select the list of hosts if defined in the OpenAPI spec
     */
    public function __construct(
        Configuration $config,
        ClientInterface $client = null,
        HeaderSelector $selector = null,
        $hostIndex = 0
    ) {
        $this->client = $client ?: new Client();
        $this->config = $config;
        $this->headerSelector = $selector ?: new HeaderSelector($this->config);
        $this->hostIndex = $hostIndex;
    }

    /**
     * Set the host index
     *
     * @param int $hostIndex Host index (required)
     */
    public function setHostIndex($hostIndex)
    {
        $this->hostIndex = $hostIndex;
    }

    /**
     * Get the host index
     *
     * @return int Host index
     */
    public function getHostIndex()
    {
        return $this->hostIndex;
    }

    /**
     * @return Configuration
     */
    public function getConfig()
    {
        return $this->config;
    }

    /**
     * Operation cancelShipment
     *
     * @param  string $shipment_id shipment_id (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\CancelShipmentResponse
     */
    public function cancelShipment($shipment_id)
    {
        $response = $this->cancelShipmentWithHttpInfo($shipment_id);
        return $response;
    }

    /**
     * Operation cancelShipmentWithHttpInfo
     *
     * @param  string $shipment_id (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\CancelShipmentResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function cancelShipmentWithHttpInfo($shipment_id)
    {
        $request = $this->cancelShipmentRequest($shipment_id);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\CancelShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation cancelShipmentAsync
     *
     * 
     *
     * @param  string $shipment_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function cancelShipmentAsync($shipment_id)
    {
        return $this->cancelShipmentAsyncWithHttpInfo($shipment_id)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation cancelShipmentAsyncWithHttpInfo
     *
     * 
     *
     * @param  string $shipment_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function cancelShipmentAsyncWithHttpInfo($shipment_id)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\CancelShipmentResponse';
        $request = $this->cancelShipmentRequest($shipment_id);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'cancelShipment'
     *
     * @param  string $shipment_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function cancelShipmentRequest($shipment_id)
    {
        // verify the required parameter 'shipment_id' is set
        if ($shipment_id === null || (is_array($shipment_id) && count($shipment_id) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $shipment_id when calling cancelShipment'
            );
        }

        $resourcePath = '/shipping/v1/shipments/{shipmentId}/cancel';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        // path params
        if ($shipment_id !== null) {
            $resourcePath = str_replace(
                '{' . 'shipmentId' . '}',
                ObjectSerializer::toPathValue($shipment_id),
                $resourcePath
            );
        }

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                []
            );
        }

        // for model (json/xml)
        if (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'POST',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation createShipment
     *
     * @param  \SellingPartnerApi\Model\Shipping\CreateShipmentRequest $body body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\CreateShipmentResponse
     */
    public function createShipment($body)
    {
        $response = $this->createShipmentWithHttpInfo($body);
        return $response;
    }

    /**
     * Operation createShipmentWithHttpInfo
     *
     * @param  \SellingPartnerApi\Model\Shipping\CreateShipmentRequest $body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\CreateShipmentResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function createShipmentWithHttpInfo($body)
    {
        $request = $this->createShipmentRequest($body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\CreateShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation createShipmentAsync
     *
     * 
     *
     * @param  \SellingPartnerApi\Model\Shipping\CreateShipmentRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function createShipmentAsync($body)
    {
        return $this->createShipmentAsyncWithHttpInfo($body)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation createShipmentAsyncWithHttpInfo
     *
     * 
     *
     * @param  \SellingPartnerApi\Model\Shipping\CreateShipmentRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function createShipmentAsyncWithHttpInfo($body)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\CreateShipmentResponse';
        $request = $this->createShipmentRequest($body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'createShipment'
     *
     * @param  \SellingPartnerApi\Model\Shipping\CreateShipmentRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function createShipmentRequest($body)
    {
        // verify the required parameter 'body' is set
        if ($body === null || (is_array($body) && count($body) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $body when calling createShipment'
            );
        }

        $resourcePath = '/shipping/v1/shipments';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                ['application/json']
            );
        }

        // for model (json/xml)
        if (isset($body)) {
            if ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode(ObjectSerializer::sanitizeForSerialization($body));
            } else {
                $httpBody = $body;
            }
        } elseif (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'POST',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation getAccount
     *
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\GetAccountResponse
     */
    public function getAccount()
    {
        $response = $this->getAccountWithHttpInfo();
        return $response;
    }

    /**
     * Operation getAccountWithHttpInfo
     *
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\GetAccountResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function getAccountWithHttpInfo()
    {
        $request = $this->getAccountRequest();
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\GetAccountResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetAccountResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\GetAccountResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetAccountResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation getAccountAsync
     *
     * 
     *
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getAccountAsync()
    {
        return $this->getAccountAsyncWithHttpInfo()
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation getAccountAsyncWithHttpInfo
     *
     * 
     *
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getAccountAsyncWithHttpInfo()
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\GetAccountResponse';
        $request = $this->getAccountRequest();
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'getAccount'
     *
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function getAccountRequest()
    {

        $resourcePath = '/shipping/v1/account';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                []
            );
        }

        // for model (json/xml)
        if (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'GET',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation getRates
     *
     * @param  \SellingPartnerApi\Model\Shipping\GetRatesRequest $body body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\GetRatesResponse
     */
    public function getRates($body)
    {
        $response = $this->getRatesWithHttpInfo($body);
        return $response;
    }

    /**
     * Operation getRatesWithHttpInfo
     *
     * @param  \SellingPartnerApi\Model\Shipping\GetRatesRequest $body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\GetRatesResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function getRatesWithHttpInfo($body)
    {
        $request = $this->getRatesRequest($body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\GetRatesResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetRatesResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\GetRatesResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetRatesResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation getRatesAsync
     *
     * 
     *
     * @param  \SellingPartnerApi\Model\Shipping\GetRatesRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getRatesAsync($body)
    {
        return $this->getRatesAsyncWithHttpInfo($body)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation getRatesAsyncWithHttpInfo
     *
     * 
     *
     * @param  \SellingPartnerApi\Model\Shipping\GetRatesRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getRatesAsyncWithHttpInfo($body)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\GetRatesResponse';
        $request = $this->getRatesRequest($body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'getRates'
     *
     * @param  \SellingPartnerApi\Model\Shipping\GetRatesRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function getRatesRequest($body)
    {
        // verify the required parameter 'body' is set
        if ($body === null || (is_array($body) && count($body) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $body when calling getRates'
            );
        }

        $resourcePath = '/shipping/v1/rates';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                ['application/json']
            );
        }

        // for model (json/xml)
        if (isset($body)) {
            if ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode(ObjectSerializer::sanitizeForSerialization($body));
            } else {
                $httpBody = $body;
            }
        } elseif (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'POST',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation getShipment
     *
     * @param  string $shipment_id shipment_id (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\GetShipmentResponse
     */
    public function getShipment($shipment_id)
    {
        $response = $this->getShipmentWithHttpInfo($shipment_id);
        return $response;
    }

    /**
     * Operation getShipmentWithHttpInfo
     *
     * @param  string $shipment_id (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\GetShipmentResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function getShipmentWithHttpInfo($shipment_id)
    {
        $request = $this->getShipmentRequest($shipment_id);
        $signedRequest = $this->config->signRequest(
            $request,
            null,
            "/shipping/v1/shipments/{shipmentId}",
            "getShipment"
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\GetShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetShipmentResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\GetShipmentResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation getShipmentAsync
     *
     * 
     *
     * @param  string $shipment_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getShipmentAsync($shipment_id)
    {
        return $this->getShipmentAsyncWithHttpInfo($shipment_id)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation getShipmentAsyncWithHttpInfo
     *
     * 
     *
     * @param  string $shipment_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getShipmentAsyncWithHttpInfo($shipment_id)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\GetShipmentResponse';
        $request = $this->getShipmentRequest($shipment_id);
        $signedRequest = $this->config->signRequest(
            $request,
            null,
            "/shipping/v1/shipments/{shipmentId}",
            "getShipment"
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'getShipment'
     *
     * @param  string $shipment_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function getShipmentRequest($shipment_id)
    {
        // verify the required parameter 'shipment_id' is set
        if ($shipment_id === null || (is_array($shipment_id) && count($shipment_id) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $shipment_id when calling getShipment'
            );
        }

        $resourcePath = '/shipping/v1/shipments/{shipmentId}';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        // path params
        if ($shipment_id !== null) {
            $resourcePath = str_replace(
                '{' . 'shipmentId' . '}',
                ObjectSerializer::toPathValue($shipment_id),
                $resourcePath
            );
        }

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                []
            );
        }

        // for model (json/xml)
        if (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'GET',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation getTrackingInformation
     *
     * @param  string $tracking_id tracking_id (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse
     */
    public function getTrackingInformation($tracking_id)
    {
        $response = $this->getTrackingInformationWithHttpInfo($tracking_id);
        return $response;
    }

    /**
     * Operation getTrackingInformationWithHttpInfo
     *
     * @param  string $tracking_id (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function getTrackingInformationWithHttpInfo($tracking_id)
    {
        $request = $this->getTrackingInformationRequest($tracking_id);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation getTrackingInformationAsync
     *
     * 
     *
     * @param  string $tracking_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getTrackingInformationAsync($tracking_id)
    {
        return $this->getTrackingInformationAsyncWithHttpInfo($tracking_id)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation getTrackingInformationAsyncWithHttpInfo
     *
     * 
     *
     * @param  string $tracking_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function getTrackingInformationAsyncWithHttpInfo($tracking_id)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\GetTrackingInformationResponse';
        $request = $this->getTrackingInformationRequest($tracking_id);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'getTrackingInformation'
     *
     * @param  string $tracking_id (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function getTrackingInformationRequest($tracking_id)
    {
        // verify the required parameter 'tracking_id' is set
        if ($tracking_id === null || (is_array($tracking_id) && count($tracking_id) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $tracking_id when calling getTrackingInformation'
            );
        }

        $resourcePath = '/shipping/v1/tracking/{trackingId}';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        // path params
        if ($tracking_id !== null) {
            $resourcePath = str_replace(
                '{' . 'trackingId' . '}',
                ObjectSerializer::toPathValue($tracking_id),
                $resourcePath
            );
        }

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                []
            );
        }

        // for model (json/xml)
        if (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'GET',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation purchaseLabels
     *
     * @param  string $shipment_id shipment_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseLabelsRequest $body body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse
     */
    public function purchaseLabels($shipment_id, $body)
    {
        $response = $this->purchaseLabelsWithHttpInfo($shipment_id, $body);
        return $response;
    }

    /**
     * Operation purchaseLabelsWithHttpInfo
     *
     * @param  string $shipment_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseLabelsRequest $body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function purchaseLabelsWithHttpInfo($shipment_id, $body)
    {
        $request = $this->purchaseLabelsRequest($shipment_id, $body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation purchaseLabelsAsync
     *
     * 
     *
     * @param  string $shipment_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseLabelsRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function purchaseLabelsAsync($shipment_id, $body)
    {
        return $this->purchaseLabelsAsyncWithHttpInfo($shipment_id, $body)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation purchaseLabelsAsyncWithHttpInfo
     *
     * 
     *
     * @param  string $shipment_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseLabelsRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function purchaseLabelsAsyncWithHttpInfo($shipment_id, $body)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\PurchaseLabelsResponse';
        $request = $this->purchaseLabelsRequest($shipment_id, $body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'purchaseLabels'
     *
     * @param  string $shipment_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseLabelsRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function purchaseLabelsRequest($shipment_id, $body)
    {
        // verify the required parameter 'shipment_id' is set
        if ($shipment_id === null || (is_array($shipment_id) && count($shipment_id) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $shipment_id when calling purchaseLabels'
            );
        }
        // verify the required parameter 'body' is set
        if ($body === null || (is_array($body) && count($body) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $body when calling purchaseLabels'
            );
        }

        $resourcePath = '/shipping/v1/shipments/{shipmentId}/purchaseLabels';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        // path params
        if ($shipment_id !== null) {
            $resourcePath = str_replace(
                '{' . 'shipmentId' . '}',
                ObjectSerializer::toPathValue($shipment_id),
                $resourcePath
            );
        }

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                ['application/json']
            );
        }

        // for model (json/xml)
        if (isset($body)) {
            if ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode(ObjectSerializer::sanitizeForSerialization($body));
            } else {
                $httpBody = $body;
            }
        } elseif (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'POST',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation purchaseShipment
     *
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseShipmentRequest $body body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse
     */
    public function purchaseShipment($body)
    {
        $response = $this->purchaseShipmentWithHttpInfo($body);
        return $response;
    }

    /**
     * Operation purchaseShipmentWithHttpInfo
     *
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseShipmentRequest $body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function purchaseShipmentWithHttpInfo($body)
    {
        $request = $this->purchaseShipmentRequest($body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation purchaseShipmentAsync
     *
     * 
     *
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseShipmentRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function purchaseShipmentAsync($body)
    {
        return $this->purchaseShipmentAsyncWithHttpInfo($body)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation purchaseShipmentAsyncWithHttpInfo
     *
     * 
     *
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseShipmentRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function purchaseShipmentAsyncWithHttpInfo($body)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\PurchaseShipmentResponse';
        $request = $this->purchaseShipmentRequest($body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'purchaseShipment'
     *
     * @param  \SellingPartnerApi\Model\Shipping\PurchaseShipmentRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function purchaseShipmentRequest($body)
    {
        // verify the required parameter 'body' is set
        if ($body === null || (is_array($body) && count($body) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $body when calling purchaseShipment'
            );
        }

        $resourcePath = '/shipping/v1/purchaseShipment';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                ['application/json']
            );
        }

        // for model (json/xml)
        if (isset($body)) {
            if ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode(ObjectSerializer::sanitizeForSerialization($body));
            } else {
                $httpBody = $body;
            }
        } elseif (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'POST',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Operation retrieveShippingLabel
     *
     * @param  string $shipment_id shipment_id (required)
     * @param  string $tracking_id tracking_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelRequest $body body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse
     */
    public function retrieveShippingLabel($shipment_id, $tracking_id, $body)
    {
        $response = $this->retrieveShippingLabelWithHttpInfo($shipment_id, $tracking_id, $body);
        return $response;
    }

    /**
     * Operation retrieveShippingLabelWithHttpInfo
     *
     * @param  string $shipment_id (required)
     * @param  string $tracking_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelRequest $body (required)
     *
     * @throws \SellingPartnerApi\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     * @return array of \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse, HTTP status code, HTTP response headers (array of strings)
     */
    public function retrieveShippingLabelWithHttpInfo($shipment_id, $tracking_id, $body)
    {
        $request = $this->retrieveShippingLabelRequest($shipment_id, $tracking_id, $body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        try {
            $options = $this->createHttpClientOption();
            try {
                $response = $this->client->send($signedRequest, $options);
                $this->writeDebug($response);
                $this->writeDebug($response->getBody()->getContents());
            } catch (RequestException $e) {
                $this->writeDebug($e->getResponse());
                $this->writeDebug($e->getResponse()->getBody()->getContents());
                throw new ApiException(
                    "[{$e->getCode()}] {$e->getResponse()->getBody()->getContents()}",
                    $e->getCode(),
                    $e->getResponse() ? $e->getResponse()->getHeaders() : null,
                    $e->getResponse() ? (string) $e->getResponse()->getBody()->getContents() : null
                );
            }

            $statusCode = $response->getStatusCode();

            if ($statusCode < 200 || $statusCode > 299) {
                throw new ApiException(
                    sprintf(
                        '[%d] Error connecting to the API (%s)',
                        $statusCode,
                        $signedRequest->getUri()
                    ),
                    $statusCode,
                    $response->getHeaders(),
                    $response->getBody()->getContents()
                );
            }

            $responseBody = $response->getBody();
            switch($statusCode) {
                case 200:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 400:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 401:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 403:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 404:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 429:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 500:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
                case 503:
                    if ('\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse' === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse', $response->getHeaders());
            }

            $returnType = '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse';
            $responseBody = $response->getBody();
            if ($returnType === '\SplFileObject') {
                $content = $responseBody; //stream goes to serializer
            } else {
                $content = (string) $responseBody;
            }

            return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());

        } catch (ApiException $e) {
            switch ($e->getCode()) {
                case 200:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 400:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 401:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 403:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 404:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 429:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 500:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
                case 503:
                    $data = ObjectSerializer::deserialize(
                        $e->getResponseBody(),
                        '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse',
                        $e->getResponseHeaders()
                    );
                    $e->setResponseObject($data);
                    break;
            }
            $this->writeDebug($e);
            throw $e;
        }
    }

    /**
     * Operation retrieveShippingLabelAsync
     *
     * 
     *
     * @param  string $shipment_id (required)
     * @param  string $tracking_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function retrieveShippingLabelAsync($shipment_id, $tracking_id, $body)
    {
        return $this->retrieveShippingLabelAsyncWithHttpInfo($shipment_id, $tracking_id, $body)
            ->then(
                function ($response) {
                    return $response[0];
                }
            );
    }

    /**
     * Operation retrieveShippingLabelAsyncWithHttpInfo
     *
     * 
     *
     * @param  string $shipment_id (required)
     * @param  string $tracking_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function retrieveShippingLabelAsyncWithHttpInfo($shipment_id, $tracking_id, $body)
    {
        $returnType = '\SellingPartnerApi\Model\Shipping\RetrieveShippingLabelResponse';
        $request = $this->retrieveShippingLabelRequest($shipment_id, $tracking_id, $body);
        $signedRequest = $this->config->signRequest(
            $request
        );

        $this->writeDebug($signedRequest);

        return $this->client
            ->sendAsync($signedRequest, $this->createHttpClientOption())
            ->then(
                function ($response) use ($returnType) {
                    $this->writeDebug($response);
                    $responseBody = $response->getBody();
                    if ($returnType === '\SplFileObject') {
                        $content = $responseBody; //stream goes to serializer
                    } else {
                        $content = (string) $responseBody;
                    }

                    return ObjectSerializer::deserialize($content, $returnType, $response->getHeaders());
                },
                function ($exception) {
                    $response = $exception->getResponse();
                    $this->writeDebug($response);
                    $statusCode = $response->getStatusCode();
                    throw new ApiException(
                        sprintf(
                            '[%d] Error connecting to the API (%s)',
                            $statusCode,
                            $exception->getRequest()->getUri()
                        ),
                        $statusCode,
                        $response->getHeaders(),
                        $response->getBody()->getContents()
                    );
                }
            );
    }

    /**
     * Create request for operation 'retrieveShippingLabel'
     *
     * @param  string $shipment_id (required)
     * @param  string $tracking_id (required)
     * @param  \SellingPartnerApi\Model\Shipping\RetrieveShippingLabelRequest $body (required)
     *
     * @throws \InvalidArgumentException
     * @return \GuzzleHttp\Psr7\Request
     */
    public function retrieveShippingLabelRequest($shipment_id, $tracking_id, $body)
    {
        // verify the required parameter 'shipment_id' is set
        if ($shipment_id === null || (is_array($shipment_id) && count($shipment_id) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $shipment_id when calling retrieveShippingLabel'
            );
        }
        // verify the required parameter 'tracking_id' is set
        if ($tracking_id === null || (is_array($tracking_id) && count($tracking_id) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $tracking_id when calling retrieveShippingLabel'
            );
        }
        // verify the required parameter 'body' is set
        if ($body === null || (is_array($body) && count($body) === 0)) {
            throw new \InvalidArgumentException(
                'Missing the required parameter $body when calling retrieveShippingLabel'
            );
        }

        $resourcePath = '/shipping/v1/shipments/{shipmentId}/containers/{trackingId}/label';
        $formParams = [];
        $queryParams = [];
        $headerParams = [];
        $httpBody = '';
        $multipart = false;

        // path params
        if ($shipment_id !== null) {
            $resourcePath = str_replace(
                '{' . 'shipmentId' . '}',
                ObjectSerializer::toPathValue($shipment_id),
                $resourcePath
            );
        }

        // path params
        if ($tracking_id !== null) {
            $resourcePath = str_replace(
                '{' . 'trackingId' . '}',
                ObjectSerializer::toPathValue($tracking_id),
                $resourcePath
            );
        }

        if ($multipart) {
            $headers = $this->headerSelector->selectHeadersForMultipart(
                ['application/json']
            );
        } else {
            $headers = $this->headerSelector->selectHeaders(
                ['application/json'],
                ['application/json']
            );
        }

        // for model (json/xml)
        if (isset($body)) {
            if ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode(ObjectSerializer::sanitizeForSerialization($body));
            } else {
                $httpBody = $body;
            }
        } elseif (count($formParams) > 0) {
            if ($multipart) {
                $multipartContents = [];
                foreach ($formParams as $formParamName => $formParamValue) {
                    $formParamValueItems = is_array($formParamValue) ? $formParamValue : [$formParamValue];
                    foreach ($formParamValueItems as $formParamValueItem) {
                        $multipartContents[] = [
                            'name' => $formParamName,
                            'contents' => $formParamValueItem
                        ];
                    }
                }
                // for HTTP post (form)
                $httpBody = new MultipartStream($multipartContents);

            } elseif ($headers['Content-Type'] === 'application/json') {
                $httpBody = \GuzzleHttp\json_encode($formParams);

            } else {
                // for HTTP post (form)
                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
            }
        }


        $defaultHeaders = [];
        if ($this->config->getUserAgent()) {
            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
        }

        $headers = array_merge(
            $defaultHeaders,
            $headerParams,
            $headers
        );

        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
        return new Request(
            'POST',
            $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
            $headers,
            $httpBody
        );
    }

    /**
     * Create http client option
     *
     * @throws \RuntimeException on file opening failure
     * @return array of http client options
     */
    protected function createHttpClientOption()
    {
        $options = [];
        if ($this->config->getDebug()) {
            $options[RequestOptions::DEBUG] = fopen($this->config->getDebugFile(), 'a');
            if (!$options[RequestOptions::DEBUG]) {
                throw new \RuntimeException('Failed to open the debug file: ' . $this->config->getDebugFile());
            }
        }

        return $options;
    }

    /**
     * Writes to the debug log file
     *
     * @param any $data
     * @return void
     */
    private function writeDebug($data)
    {
        if ($this->config->getDebug()) {
            file_put_contents($this->config->getDebugFile(), '[' . date('Y-m-d H:i:s') . ']: ' . print_r($data, true) . "\n", FILE_APPEND);
        }
    }
}
