---
title: sourceIdentifier
framework: storekittest
role: symbol
role_heading: Instance Property
path: storekittest/skadtestpostback/sourceidentifier
---

# sourceIdentifier

A string that identifies an ad campaign.

## Declaration

```swift
var sourceIdentifier: String? { get }
```

## Discussion

Discussion The source identifier in a winning postback may contain two, three, or all four digits of the sourceIdentifier in the corresponding ad impression. For more information about the value you may get in the postback, see Receiving postbacks in multiple conversion windows.

## See Also

### Getting advertisement information

- [adNetworkIdentifier](storekittest/skadtestpostback/adnetworkidentifier.md)
- [appStoreItemIdentifier](storekittest/skadtestpostback/appstoreitemidentifier.md)
- [sourceAppStoreItemIdentifier](storekittest/skadtestpostback/sourceappstoreitemidentifier.md)
- [sourceDomain](storekittest/skadtestpostback/sourcedomain.md)