Re: [w3c/payment-handler] Open Window Algorithm and tracking through 1ps (#351)

@danyao wrote "legitimate payment handlers".

This definition remains a problem.  Assume that you want to create a wallet. That is, a `PaymentHandler` holding payment resources from multiple and independent payment providers.  To succeed with that you need to (ab)use `PaymentRequest` for payment resource enrollments as well, in addition to heavily depend on 1p storage.

This is already a fact for native payment handlers like
https://cyberphone.github.io/doc/saturn/saturn-v3-presentation.pdf#page=4  

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