CreditCard::class, //maps GatewayType => Implementation class ]; const SYSTEM_LOG_TYPE = SystemLog::TYPE_STRIPE; public function setPaymentMethod($payment_method_id) { $class = self::$methods[$payment_method_id]; $this->payment_method = new $class($this); return $this; } public function authorizeView(array $data) { return $this->payment_method->authorizeView($data); //this is your custom implementation from here } public function authorizeResponse($request) { return $this->payment_method->authorizeResponse($request); //this is your custom implementation from here } public function processPaymentView(array $data) { return $this->payment_method->paymentView($data); //this is your custom implementation from here } public function processPaymentResponse($request) { return $this->payment_method->paymentResponse($request); //this is your custom implementation from here } public function refund(Payment $payment, $amount, $return_client_response = false) { return $this->payment_method->yourRefundImplementationHere(); //this is your custom implementation from here } public function tokenBilling(ClientGatewayToken $cgt, PaymentHash $payment_hash) { return $this->payment_method->yourTokenBillingImplmentation(); //this is your custom implementation from here } }