Add support for Adyen payment method Open banking / PaybyBank

See #41

Author: remcotolsma

src/Gateway.php

@@ -82,6 +82,7 @@ public function __construct( Config $config ) {
 		$this->register_payment_method( new PaymentMethod( PaymentMethods::KLARNA_PAY_OVER_TIME ) );
 		$this->register_payment_method( new PaymentMethod( PaymentMethods::MB_WAY ) );
 		$this->register_payment_method( new PaymentMethod( PaymentMethods::MOBILEPAY ) );
+		$this->register_payment_method( new PaymentMethod( PaymentMethods::PAY_BY_BANK ) );
 		$this->register_payment_method( new PaymentMethod( PaymentMethods::PAYPAL ) );
 		$this->register_payment_method( new PaymentMethod( PaymentMethods::SOFORT ) );
 		$this->register_payment_method( new PaymentMethod( PaymentMethods::SWISH ) );

src/PaymentMethodType.php

@@ -179,6 +179,14 @@ class PaymentMethodType {
 	 */
 	const MULTIBANCO = 'multibanco';
 
+	/**
+	 * Constant for the 'PaybyBank' payment method type.
+	 *
+	 * @link https://www.adyen.com/nl_NL/betaalmethoden/open-banking
+	 * @var string
+	 */
+	const PAYBYBANK = 'paybybank';
+
 	/**
 	 * Constant for the 'PayPal' payment method type.
 	 *
@@ -244,6 +252,7 @@ class PaymentMethodType {
 		PaymentMethods::MAESTRO              => self::MAESTRO,
 		PaymentMethods::MB_WAY               => self::MB_WAY,
 		PaymentMethods::MOBILEPAY            => self::MOBILEPAY,
+		PaymentMethods::PAY_BY_BANK          => self::PAYBYBANK,
 		PaymentMethods::PAYPAL               => self::PAYPAL,
 		PaymentMethods::SOFORT               => self::DIRECT_EBANKING,
 		PaymentMethods::SWISH                => self::SWISH,