[paymentrequest] Payment App Registration: Same Origin is problematic for identifying_url (#66)

identifying_url is used to match the payment method url in the payment request, which is typically the payment scheme in a traditional card system (i.e. Visa, Mastercard, Amex, etc...). So limiting payment app to the same origin as the identifying_url means we're limiting payment app to scheme-based app (so no issuing bank payment app for instance). It feels very unatural for issuing banks that actually own the account and the card number to not be able to use the card in their own payment app.

It should be possible to define a payment method that can be used by multiple payment apps, but it's not possible with the current constraint.

---
Reply to this email directly or view it on GitHub:
https://github.com/WICG/paymentrequest/issues/66