code: public function createInboundShipment($request)
      {
          if (!($request instanceof FBAInboundServiceMWS_Model_CreateInboundShipmentRequest)) {
              $request = new FBAInboundServiceMWS_Model_CreateInboundShipmentRequest($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'CreateInboundShipment';
          $httpResponse = $this->_invoke($parameters);
  
          $response = FBAInboundServiceMWS_Model_CreateInboundShipmentResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: Create Inbound Shipment
  Creates an inbound shipment. It may include up to 200 items.
  The initial status of a shipment will be set to 'Working'.
  This operation will simply return a shipment Id upon success,
  otherwise an explicit error will be returned.
  More items may be added using the Update call.
  
  @param mixed $request array of parameters for FBAInboundServiceMWS_Model_CreateInboundShipment request or FBAInboundServiceMWS_Model_CreateInboundShipment object itself
  @see FBAInboundServiceMWS_Model_CreateInboundShipmentRequest
  @return FBAInboundServiceMWS_Model_CreateInboundShipmentResponse
  
  @throws FBAInboundServiceMWS_Exception