Re: [browser-payment-api] Different card schemes have different mandatory field requirements (#9)

> Should we really be defining the standard for these card types at all, or should we be getting the card schemes more involved? (I realise this question has been posed a few times, but we've never got down to some real examples of why this is needed before)

I expect it to be necessary to support card types from schemes who have never heard of W3C and are not participating in the group.

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