Re: [w3c/webpayments] How can a Web Based Payment App cancel the payment flow? (#128)

I agree that it should be handled in the ``submitPaymentResponse`` request. I also think it would be better to leave this up to the payment app to decide and encode it into the payment response data. The merchant should already know how to handle a payment response for any payment method it supports so the same expectation is there for any error/cancel response. Error or cancel response can also be very specific to a given payment method, so trying to encapsulate this into a new concept in the spec will only restrict their capabilities.

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