---
title: appTransactionID
framework: storekit
role: symbol
role_heading: Instance Property
path: storekit/apptransaction/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 }
```

## Mentioned in

Generating JWS to sign App Store requests

## Discussion

Discussion The App Store generates a single, globally unique appTransactionID for each Apple Account that downloads your app and for each family group member for apps that support Family Sharing. This value remains the same for the same Apple Account and app if the customer redownloads the app on any device, receives a refund, repurchases the app, or changes the storefront. For apps that support Family Sharing, the appTransactionID is unique for each family group member. The appTransactionID is available even if a customer makes no in-app purchases. The App Store server and StoreKit provide the appTransactionID in the following APIs: This symbol, appTransactionID, in the AppTransaction object appTransactionID, in the subscription renewal information Product.SubscriptionInfo.RenewalInfo appTransactionID, in the transaction information Transaction In transaction and subscription renewal information you receive from notifications, App Store Server Notifications V2 In transaction and subscription renewal information you receive from the App Store Server API