[Spec] Add note on SPC opt-in, and misc clarifications

w3c / secure-payment-confirmation

Secure Payment Confirmation (SPC)

https://w3c.github.io/secure-payment-confirmation/

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[Spec] Add note on SPC opt-in, and misc clarifications #183

Closed stephenmcgruer closed 2 years ago

stephenmcgruer commented 2 years ago

This PR adds a note about what SPC opt-in means today (required for any use of SPC) versus in our preferred future (required for 3p use of SPC). It also contains a set of small clarifications, e.g. updating the 'steps to silently determine...' to acknowledge that an RP ID will likely be needed.

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stephenmcgruer commented 2 years ago

No major changes here (and nothing normative), just some minor clarifications I felt were useful as I look at how we might change the spec in the medium-term future. I'm hoping to also follow this up with a PR explicitly spec-ing the user-agent caching mechanism, but that may take a while :/