Re: [webpayments] How are cloud-based payment instruments supported? (#16)

I suggest that we support cloud-based payment instruments and local payment instruments using the same mechanism. There is a URL that is used to invoke the payment instrument. Local Android payment instruments would use an Intent URL (or something similar). Cloud-based instruments would use an HTTP-based URL. Both would have a callback URL (either another Intent URL or an HTTP-based URL).

I admit that this proposal is a bit hand wavy as I do not have a great deal of experience routing messages from a browser to an intent-based URL and back to the browser.

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https://github.com/w3c/webpayments/issues/16#issuecomment-161177435