---
title: appTransactionID
framework: storekit
role: symbol
role_heading: Instance Property
path: storekit/transaction/apptransactionid
---

# appTransactionID

The unique identifier of the app download transaction.

## Declaration

```swift
@backDeployed(before: iOS 18.4, macOS 15.4, tvOS 18.4, watchOS 11.4, visionOS 2.4)
var appTransactionID: String { get }
```

## Discussion

Discussion The App Store server APIs and StoreKit provide this value in several APIs. For more information, see appTransactionID in AppTransaction.

## See Also

### Transaction properties

- [Transaction properties](storekit/transaction-properties.md)