Re: [w3c/webpayments] Registration: App supports method but user has no instrument for that method (#110)

I have a similar question for you. If I have a payment app 1 which supports methods A, B and another payment app 2 which supports methods B and C. Will the instrument B need to be registered again in second payment application or will there be any mechanism to share it, avoiding providing payment information again?
I'm mainly thinking about credit cards here as there are many providers and users will need to provide card information for all PSP if not shared (which won't be the case for Paypal for instance).

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