> I'm likely behind the times but previously the first interaction like that was show(), so the website could not access billing address, payment address, etc. before show().
That remains true. But once `show()` is called, the browser UI can mediate the billing address with the site in the same way we do for shipping address (via an appropriate event). We could do that without sending the credit card details.
Payments Requests can only proceed to completion with verification that the shipping address is OK.
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