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

> I think there's still a problem here, irrespective of Maestro. Expiration month, expiration year, and cardholder name are all optional fields for a UnionPay card. As it stands the spec therefore won't work for basic card payments in mainland China (or Russia, for that matter, where UnionPay cards are also issued).

This is a good example of where we have to decide whether this is the same schema or a different one. The goal shouldn't be to create one universal data structure. We can have multiple different ones (and should where it makes sense).

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