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

I think they are one of the targets for this API, but they are not the only payment apps we can or should care about supporting with this API.

That said, I agree that if this is critical it should be included in the API. I think the complexities I mentioned are still present, so would appreciate more thoughts if people have them. 

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https://github.com/WICG/paymentrequest/issues/23#issuecomment-161164622