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# invalidPostbackURL

The URL for the postback isn’t valid, in the testing environment.

```
static var invalidPostbackURL: SKAdTestError.Code { get }
```

## Discussion

Check that the URL is valid in the [`postbackURL`](/documentation/StoreKitTest/SKAdTestPostback/postbackURL) parameter in [`SKAdTestPostback`](/documentation/StoreKitTest/SKAdTestPostback).

---

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