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# appTransactionId

The unique identifier of the app download transaction.

```
string appTransactionId
```

## Discussion

To get app transaction information, call [`Get App Transaction Info`](/documentation/AppStoreServerAPI/Get-App-Transaction-Info) and provide the `appTransactionId`.

For more information, see <doc://com.apple.documentation/documentation/StoreKit/AppTransaction/appTransactionID>.

---

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