Re: [paymentrequest] API needs equivalent of PassKit's paymentAuthorizationViewController:didAuthorizePayment:completion: callback (#23)

> Well, I think in most cases the UI can be dismissed after an instrumentResponse is received. Apple Pay and Android Pay are rare cases where there is an additional call to indicate success or failure.

I'm not sure we can say "Apple Pay and Android Pay are rare cases", when they are the primary targets for this API. From Mozilla's perspective, these APIs MUST work well primarily with iOS and Android. 

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