[w3c/browser-payment-api] How can short payment method identifiers be successful (#123)

The Payment Method Identifiers spec suggests that short identifiers should be possible for common payment methods. The canonical example being "visa". Perhaps I don't fully grasp the proposal, but I don't understand how the payment mediator or the merchant can achieve the end goal with "visa" as the only identification.

To my knowledge some processors require different details than others under different types of integrations. For instance sometimes just the credit card number, expiration and CVV are enough, whereas at other times a full address is also required. How are these differences in requirements meant to be handled?

Would the payment mediator supply all of the potentially useful information for all requests even when it is technically superfluous?

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