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

@marcoscaceres Bike-shedding yay! I propose: `checkoutCode` 😬 

+1 to both stories. I agree we can just drop the couponAccepted flag.
"Applying" the coupon is done by the merchant through the line items.
i.e. If the merchant accepts a coupon they can:
  1. Return empty/undefined `couponErrors`
  2. Add a line item to reflect the discount indicating to the user that it was accepted

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