https://www.w3.org/standards/history/payment-request/
Payment Request API publication history | Standards | W3C
The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web...
payment request apipublicationhistorystandardsw3c
https://web.dev/articles/how-payment-request-api-works
Payment Request API overview | web.dev
Sep 10, 2018 - Learn how the Payment Request API works at a high level.
payment request apiweb devoverview