The signed discount applied to a payment.
- iOS 12.2+
- macOS 10.14.4+
- tvOS 12.2+
SKPayment contains the details of a subscription offer discount that you want to apply to a
Include the signature that you generated in this object. For guidance, see Generating a Signature for Subscription Offers. The App Store uses this signature and the parameters to validate the subscription offer. Keep in mind that the signature must correspond to the parameters in the payment for a transaction to be successful.