5.21.0

Included commits: 5.20.0...5.21.0

Improvements

• Introduced PaymentFacade::generatePaymentMethodKey() method.
• Introduced PaymentMethod.paymentMethodAppConfiguration transfer property.
• Introduced PaymentMethodAppConfiguration transfer.
• Introduced Endpoint transfer.
• Added paymentMethodAppConfiguration to the AddPaymentMethod message.
• Use paymentMethodAppConfiguration when present otherwise fall back to the former used paymentAuthorizationEndpoint.
• Added the new optional column payment_method_app_configuration to the spy_payment_method table.