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

Hi, @plinss, @kenchris, and I each looked at this during our vF2F this week, and I've got a couple basic questions:

1. Is this necessary? Existing payment methods (e.g. Apple Pay) already securely confirm payments. (If it is necessary, how does it interact with existing payment methods which already have secure confirmation built in?)
2. I realize that your explainer already states, in bold, that a fallback mechanism still needs to be designed. That said, it's hard to evaluate the proposal without one. Have you designed a fallback mechanism since filing this request? If so, could you update the explainer with details?

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