Re: [w3c/payment-handler] What happens when clearing site data? (#236)

> As far as I know, when clearing site data, all registered SW will be removed as well. Then, even if PaymentInstruments store is independent on SW life cycle, users will still have to revisit the third-party payment site to re-register SW. 

This is correct, and also fine. The point of clearing site data is to break these relationships. If the user wishes to establish the relationship with the site, then they should revisit it... and their payments instruments can be restored + the site can again ask for permission to manage them. 

> (If there is no SW, how can PaymentInstruments map with SW?)

Through an explicit means to do so, which is the thing we are trying to work out. 

> Instruments will appear on payment sheet.

You missed a step, no? That is:

> 5. user selects "payment method" (e.g., E.g., AmazonPay). 

The payment method "Hello Pay" is no longer available, because site data was cleared.  



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