code: public function getTransportContent($request)
      {
          if (!($request instanceof FBAInboundServiceMWS_Model_GetTransportContentRequest)) {
              $request = new FBAInboundServiceMWS_Model_GetTransportContentRequest($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'GetTransportContent';
          $httpResponse = $this->_invoke($parameters);
  
          $response = FBAInboundServiceMWS_Model_GetTransportContentResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: Get Transport Content
  A read-only operation which sellers use to retrieve the current
  details about the transportation of an inbound shipment, including status of the
  partnered carrier workflow and status of individual packages when they arrive at our FCs.
  
  @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetTransportContent request or FBAInboundServiceMWS_Model_GetTransportContent object itself
  @see FBAInboundServiceMWS_Model_GetTransportContentRequest
  @return FBAInboundServiceMWS_Model_GetTransportContentResponse
  
  @throws FBAInboundServiceMWS_Exception