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# appVersionID

The number that the App Store uses to uniquely identify the version of the app.

```
let appVersionID: UInt64?
```

## Discussion

The App Store assigns this value. In the [`sandbox`](/documentation/StoreKit/AppStore/Environment/sandbox) and [`xcode`](/documentation/StoreKit/AppStore/Environment/xcode) environments, this value is `nil`.

---

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