private function _convertGetShipment($request) {

        $parameters = array();
        $parameters['Action'] = 'GetShipment';
        if ($request->isSetSellerId()) {
            $parameters['SellerId'] =  $request->getSellerId();
        }
        if ($request->isSetMWSAuthToken()) {
            $parameters['MWSAuthToken'] =  $request->getMWSAuthToken();
        }
        if ($request->isSetShipmentId()) {
            $parameters['ShipmentId'] =  $request->getShipmentId();
        }

        return $parameters;
    }
private function _convertGetShipment($request) {

        $parameters = array();
        $parameters['Action'] = 'GetShipment';
        if ($request->isSetSellerId()) {
            $parameters['SellerId'] =  $request->getSellerId();
        }
        if ($request->isSetMWSAuthToken()) {
            $parameters['MWSAuthToken'] =  $request->getMWSAuthToken();
        }
        if ($request->isSetShipmentId()) {
            $parameters['ShipmentId'] =  $request->getShipmentId();
        }

        return $parameters;
    }
Convert GetShipmentRequest to name value pairs