Re: [w3c/payment-request] Spec is silent on its role in facilitating arbitrary communication between top level contexts (#936)

One slight concern I have with the proposed wording is any assumption it makes on a feature (Payment Handler) which is not yet standardized. *If* we were to find a way to specify Payment Handlers in a way that data could be shared by the page with a handler before the user has expressed consent (e.g. to check for enrolled instrument), but prevent that handler to store or send any data anywhere (especially back to the page) until and unless the user has expressed consent, would that satisfy the text as proposed?

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