Easy enough to implement with the Payment Request API [0], which is a standard, and implemented in most browsers, and most payment processors. [0] https://deve

Easy enough to implement with the Payment Request API [0], which is a standard, and implemented in most browsers, and most payment processors. [0] https://developer.mozilla.org/en-US/docs/Web/API/Payment_Request_API https://developer.mozilla.org/en-US/docs/Web/API/Payment_Req...