[w3c/payment-request] Question about use case Payment Request API (Issue #1033)

Hi Team,

I would like to know more about a use case for the Payment Request API. 

We have a scenario where we are at a store checkout and we need to authenticate the user on a parent site, this site contains all their saved data, such as cards and shipping data. To do this, we would start a session within the Payment Request API environment and only return a token that allows the checkout site to read the data saved on the parent site. 

![Sem título-2024-09-11-0916](https://github.com/user-attachments/assets/4f1e8140-5efa-4d22-9e9b-934fd5df82ca)

Our question is, do you see that this can be implemented? Have you seen scenarios similar to this? Would it be a use case for this API? 



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