src/MWSMerchantFulfillmentService/Client.php
public function cancelShipment($request)
    {
        if (!($request instanceof MWSMerchantFulfillmentService_Model_CancelShipmentRequest)) {
            require_once (dirname(__FILE__) . '/Model/CancelShipmentRequest.php');
            $request = new MWSMerchantFulfillmentService_Model_CancelShipmentRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'CancelShipment';
        $httpResponse = $this->_invoke($parameters);

        require_once (dirname(__FILE__) . '/Model/CancelShipmentResponse.php');
        $response = MWSMerchantFulfillmentService_Model_CancelShipmentResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }
public function cancelShipment($request)
    {
        if (!($request instanceof MWSMerchantFulfillmentService_Model_CancelShipmentRequest)) {
            require_once (dirname(__FILE__) . '/Model/CancelShipmentRequest.php');
            $request = new MWSMerchantFulfillmentService_Model_CancelShipmentRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'CancelShipment';
        $httpResponse = $this->_invoke($parameters);

        require_once (dirname(__FILE__) . '/Model/CancelShipmentResponse.php');
        $response = MWSMerchantFulfillmentService_Model_CancelShipmentResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }
Cancel Shipment
Cancels an existing shipment.  This will only succeed if the cancellation window has not passed and if the shipment
has not been cancelled already.

@param mixed $request array of parameters for MWSMerchantFulfillmentService_Model_CancelShipment request or MWSMerchantFulfillmentService_Model_CancelShipment object itself
@see MWSMerchantFulfillmentService_Model_CancelShipmentRequest
@return MWSMerchantFulfillmentService_Model_CancelShipmentResponse

@throws MWSMerchantFulfillmentService_Exception