---
title: previousOriginalTransactionID
framework: storekit
role: symbol
role_heading: Instance Property
path: storekit/transaction/previousoriginaltransactionid
---

# previousOriginalTransactionID

The original transaction ID of the subscription this one replaced when a customer switched between a standalone auto-renewable subscription and a subscription bundle (in either direction).

## Declaration

```swift
@backDeployed(before: iOS 27.0, macOS 27.0, tvOS 27.0, watchOS 27.0, visionOS 27.0)
var previousOriginalTransactionID: UInt64? { get }
```

## Discussion

Discussion For a bundle transaction, this is the standalone subscription’s original transaction ID, while for a standalone transaction, this is the bundle’s original transaction ID. This field is nil if no such switch occurred.