Re: [w3c/payment-request] Retrying a payment (#705)

I guess that makes sense.

I wonder if there's a way to make "await things getting fixed by the user easier". Maybe if retry() returned a promise that resolved next time the "Pay" button was pressed?

In particular, I'm concerned about the complexity of your sample code for a merchant that just wants to do validation all at once, without dealing with the *change events. They just want to wait for the pay button to be clicked, check the fields, and ask for a retry if the fields are wrong. Then repeat until the fields are right.

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