Re: [w3c/payment-request] Support for gift cards and discount codes (#145)

> I think you have overloaded couponAccepted. The user should be allowed to change the code even if the merchant has accepted it.

I had the same thought. I don't think we would really need couponAccepted… if the merchant doesn't return an error from the event then we can assume it's valid. I also think we shouldn't restrict to a single applied coupon as that will still not be flexible enough for sites and we'd have to fix that later.

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