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

> It is not clear to me how an API instantiated on a merchant page will deal with redirects to a payment provider site and still be able to provide a return result.

To be clear, this is also possible via URL-based callbacks, you can relay messages using that mechanism, but it forces Web developers to initiate a payment at one location and complete it at another location (which is done today, but it's not as nice as just waiting for a promise to be fulfilled). Note that this second approach is sort of what the HTTP API uses (because that sort of programming paradigm is more common place in non-browser HTTP clients):

http://web-payments.github.io/web-payments-http-api/#processing-a-payment-request

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https://github.com/w3c/webpayments/issues/16#issuecomment-161503004