Re: [w3ctag/design-reviews] Secure Payment Confirmation (#544)

Just realized that I didn't fully answer the first question:

> (If it is necessary, how does it interact with existing payment methods which already have secure confirmation built in?)

Currently Secure Payment Confirmation is designed as a payment method itself, so it does not interact with existing payment methods that have built-in secure confirmation.

Some developers requested that SPC be made into a capability that they can use when building web-based payment handlers using [Payment Handler API][ph] (see SPC & SRC discussion in https://www.w3.org/2020/10/20-wpwg-minutes.html). But this use case needs to be better understood before we can propose a design to incorporate it.

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