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# SKPaymentDiscount

The signed discount to apply to a payment.

```
class SKPaymentDiscount
```

## Overview

The [`SKPaymentDiscount`](/documentation/StoreKit/SKPaymentDiscount) contains the details of a promotional offer discount that you want to apply to a [`SKMutablePayment`](/documentation/StoreKit/SKMutablePayment).

Include the signature that you generated in this object. For guidance, see [Generating a signature for promotional offers](/documentation/StoreKit/generating-a-signature-for-promotional-offers). The App Store uses this signature and the parameters to validate the promotional offer. Keep in mind that the signature must correspond to the parameters in the payment for a transaction to be successful.

## Topics

### Initializing a Payment Discount

[`init(identifier:keyIdentifier:nonce:signature:timestamp:)`](/documentation/StoreKit/SKPaymentDiscount/init(identifier:keyIdentifier:nonce:signature:timestamp:))

Initializes the payment discount with a signature and the parameters used by the signature.

### Identifying the Discount

[`identifier`](/documentation/StoreKit/SKPaymentDiscount/identifier)

A string used to uniquely identify a discount offer for a product.

[`keyIdentifier`](/documentation/StoreKit/SKPaymentDiscount/keyIdentifier)

A string that identifies the key used to generate the signature.

### Validating the Discount

[`nonce`](/documentation/StoreKit/SKPaymentDiscount/nonce)

A universally unique ID (UUID) value that you define.

[`signature`](/documentation/StoreKit/SKPaymentDiscount/signature)

A string representing the properties of a specific promotional offer, cryptographically signed.

[`timestamp`](/documentation/StoreKit/SKPaymentDiscount/timestamp)

The date and time of the signature’s creation in milliseconds, formatted in Unix epoch time.


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