The external gateway object and the allowed CRUD operations on the related resource endpoint
External payment gateways let you integrate any payment service that is not available out-of-the-box (even your custom one) and safely process any type of external payment.
To create an external gateway choose a meaningful name that helps you identify it within your organization and specify the endpoints you have configured externally. You need to provide your gateway's authorize, capture, void, refund, and customer token URLs. Your external endpoint will be responsible for the actual integration with the payment gateway. The payment source associated with the order must be an external payment.