Re: [w3c/browser-payment-api] Should the merchant be able to request your email and recipient phone number (#1)

@ianbjacobs 
Using a list of tokens means the API spec does not need to change in future for new types to be added.

I believe that we should approach the conformance around this functionality as a "best effort". In other words some browsers will be able to gather some data and others won't but we should have a hard-coded list that they MUST define UI for.

In the same vein, the flow must fail gracefully if the browser is unable to provide certain data and the request to get the data should either be passed to the payment app or left to the website to get after the payment response has been received.

If the payment request should not be passed to the payment app at all without the data having been captured then we need to handle that case too.

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