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