<!--
{
  "availability" : [
    "iOS: 11.3.0 -",
    "iPadOS: 11.3.0 -",
    "macCatalyst: 13.1.0 -",
    "tvOS: 11.3.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "StoreKit",
  "identifier" : "/documentation/StoreKit/SKStoreProductParameterAdNetworkNonce",
  "metadataVersion" : "0.1.0",
  "role" : "Global Variable",
  "symbol" : {
    "kind" : "Global Variable",
    "modules" : [
      "StoreKit"
    ],
    "preciseIdentifier" : "c:@SKStoreProductParameterAdNetworkNonce"
  },
  "title" : "SKStoreProductParameterAdNetworkNonce"
}
-->

# SKStoreProductParameterAdNetworkNonce

The key that represents a random value to use for added security.

```
let SKStoreProductParameterAdNetworkNonce: String
```

## Discussion

The value for this key is an <doc://com.apple.documentation/documentation/Foundation/NSUUID>. Ad networks generate a random value for this key at the time of the ad impression.

> Important:
> When you generate the signature value (``doc://com.apple.storekit/documentation/StoreKit/SKStoreProductParameterAdNetworkAttributionSignature``), you must sign the nonce as an all-lowercase UUID string representation.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)