Re: [webpayments] How are cloud-based payment instruments supported? (#16)

> I think this information would be in the payment request and would be another piece of data in the "acceptedPaymentScheme" entry. That is, the merchant would say "I accept tokenized card transactions and here is my TSP". The buyer would select their "tokenized card" payment instrument, which would then redirect to the payment instrument issuer, which would then redirect to the merchant's TSP.

I think this is a workable solution for PSP supplied tokens. I think issuer supplied tokens could work in this way also, though most issuer token today are supplied out of band and stored in a a wallet (e.g. ApplePay). So we need to cover both the just in time tokenised flow and the pre-tokenised flow. These will be documented as part of the flows Task Force.

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