Omnipay\Common\GatewayInterface::initialize PHP Метод

    public function initialize(array $parameters = array());

 /**
  * Set payment gateway
  *
  * @param Payment_geteways $paymentGateway
  *
  * @return $this
  */
 public function setGateway(Payment_gateways $paymentGateway)
 {
     $this->gateway = $this->gatewayFactory->createGateway($paymentGateway);
     $parameters = $paymentGateway->getDecodedData();
     $isSandbox = $this->systemStatus->isSandboxPayment();
     $gatewayParams = array();
     switch ($paymentGateway->slug) {
         case 'paypal_express':
             $gatewayParams = array('testMode' => $isSandbox);
             break;
         case 'authorize.net_sim':
             $gatewayParams = array('testMode' => false, 'developerMode' => $isSandbox);
             break;
     }
     $parameters = array_merge($parameters, $gatewayParams);
     $this->gateway->initialize($parameters);
     return $this;
 }