Re: [w3c/payment-request] Some clarifications with Payment Request API (#774)

@ianbjacobs I don't think that will work since browsers rate-limit to prevent one site from making multiple requests with different lists of payment methods to sniff which methods the user has.

In practice, I think it's unavoidable that merchants currently need to know via some method external to the API which methods are possibly supported in one browser if they want to customize the UI.

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