This is what GNU Taler [0] does. You can send additional headers[1] to decide how the payment will be processed, such as X-Taler-Contract-Url and X-Taler-Offer-

This is what GNU Taler [0] does. You can send additional headers[1] to decide how the payment will be processed, such as X-Taler-Contract-Url and X-Taler-Offer-Url [1]: https://docs.taler.net/merchant/frontend/python/html/tutorial.html#Headers-for-HTTP-402 https://docs.taler.net/merchant/frontend/python/html/tutoria... [0]: https://taler.net/en/index.html https://taler.net/en/index.html