Re: [w3c/browser-payment-api] How are digital signatures supported for Payment Requests? (#291)

> Another way to phrase this question is "What is the information that needs to be digitally signed?"

No, I think it's possible for each payment method to define a signature mechanism that also specifies what information needs to be signed.

Different payment systems are going to have different requirements for the digital signatures and so the data that is signed for each payment method is likely to be different (and the algorithm used etc).

I would class signatures in the same category as callbacks. They will likely be used by a lot of payment methods but it's not clear that we should try to standardize them at the top-level yet.

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