PKPaymentRequestCouponCodeUpdate
An object that updates the payment request after the coupon code changes.
Declaration
class PKPaymentRequestCouponCodeUpdateOverview
This is the handler for paymentAuthorizationController(_:didChangeCouponCode:handler:) and paymentAuthorizationViewController(_:didChangeCouponCode:handler:).
Use this object to update the summary items to reflect the change in the coupon code.