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# SKAdTestError.Code.unlinkedWinningPostbacks

The postbacks aren’t correctly related to one another.

```
case unlinkedWinningPostbacks
```

## Discussion

To create multiple winning postbacks for testing multiple conversion windows, use the [`winningPostbacks(withVersion:adNetworkIdentifier:sourceIdentifier:appStoreItemIdentifier:sourceAppStoreItemIdentifier:sourceDomain:fidelityType:isRedownload:postbackURL:)`](/documentation/StoreKitTest/SKAdTestPostback/winningPostbacks(withVersion:adNetworkIdentifier:sourceIdentifier:appStoreItemIdentifier:sourceAppStoreItemIdentifier:sourceDomain:fidelityType:isRedownload:postbackURL:)) method.

---

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