[w3c/browser-payment-api] API assumes Issuer communication is OOB (#447)

The current Web Payment API does the (implicit) assumption that interactions with the issuer is performed OOB.  However, the Saturn payment authorization scheme uses a "conversational" mode where all "Wallet" communication goes through the Merchant.  It is therefore incompatible with the Web Payment API.  It might be worth knowing at least.

https://cyberphone.github.io/doc/saturn/bank2bank-payment.html#provuserresp

Why the Saturn Wallet only talks to the Merchant?  Because it has considerable _system_ advantages.

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https://github.com/w3c/browser-payment-api/issues/447