---
title: SKAdTestError.Code.invalidSourceIdentifier
framework: storekittest
role: symbol
role_heading: Case
path: storekittest/skadtesterror/code/invalidsourceidentifier
---

# SKAdTestError.Code.invalidSourceIdentifier

The postback’s identifier isn’t two, three, or four digits.

## Declaration

```swift
case invalidSourceIdentifier
```

## Discussion

Discussion A valid postback includes two to four digits of the impression’s sourceIdentifier. For more information about the varying length of source identifiers, see Receiving postbacks in multiple conversion windows.

## See Also

### Other Errors

- [SKAdTestError.Code.invalidVersion](storekittest/skadtesterror/code/invalidversion.md)
- [SKAdTestError.Code.invalidImpressionId](storekittest/skadtesterror/code/invalidimpressionid.md)
- [SKAdTestError.Code.invalidSourceAppAdamId](storekittest/skadtesterror/code/invalidsourceappadamid.md)
- [SKAdTestError.Code.invalidSourceDomain](storekittest/skadtesterror/code/invalidsourcedomain.md)
- [SKAdTestError.Code.unknownError](storekittest/skadtesterror/code/unknownerror.md)
- [SKAdTestError.Code.invalidVersion](storekittest/skadtesterror/code/invalidversion.md)
- [SKAdTestError.Code.invalidImpressionId](storekittest/skadtesterror/code/invalidimpressionid.md)
- [SKAdTestError.Code.invalidSourceAppAdamId](storekittest/skadtesterror/code/invalidsourceappadamid.md)
- [SKAdTestError.Code.invalidSourceDomain](storekittest/skadtesterror/code/invalidsourcedomain.md)
- [SKAdTestError.Code.unknownError](storekittest/skadtesterror/code/unknownerror.md)