Re: [w3c/payment-request] Consider specifying a testing IDL for a mock payment UI (#799)

@danyao can you describe the minimal required API to make this work? Would it suffice to just instruct the browser to provide mock UI-free payment methods? Would there have to be a callback to the test code when the payment instrument has been used, or could tests just try to make a payment and then look at the result?

I think there are similarities with https://github.com/web-platform-tests/wpt/issues/12046, and possibly something simple like https://w3c.github.io/permissions/#automation could suffice.

This would also allow web developers to test their code, although I don't know if that's a real ask or if they'd just mock out the entire API instead.

CC @LukeZielinski

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