code: public function listAllFulfillmentOrdersByNextToken($request)
      {
          if (!($request instanceof FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextTokenRequest)) {
              $request = new FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextTokenRequest($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'ListAllFulfillmentOrdersByNextToken';
          $httpResponse = $this->_invoke($parameters);
  
          $response = FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextTokenResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: List All Fulfillment Orders By Next Token
  Gets the next set of fulfillment orders that are currently being
  being fulfilled or that were being fulfilled at some time in the
  past.
  
  If a NextToken is not returned, it indicates the end-of-data.
  
  @param mixed $request array of parameters for FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextToken request or FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextToken object itself
  @see FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextTokenRequest
  @return FBAOutboundServiceMWS_Model_ListAllFulfillmentOrdersByNextTokenResponse
  
  @throws FBAOutboundServiceMWS_Exception