code: public function findGatewayById($process_id, $gateway_id)
      {
          list($response) = $this->findGatewayByIdWithHttpInfo($process_id, $gateway_id);
          return $response;
      }
docs: Operation findGatewayById
  
  
  
  @param string $process_id ID of the process to return (required)
  @param string $gateway_id ID of gateway to return (required)
  @return \ProcessMaker\PMIO\Model\GatewayItem
  @throws \ProcessMaker\PMIO\ApiException on non-2xx response