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# postbackURL

A URL on your server where the testing environment sends test postbacks.

```
var postbackURL: String { get }
```

## Discussion

The testing environment sends the test postback to the [`postbackURL`](/documentation/StoreKitTest/SKAdTestPostback/postbackURL) when you call [`flushPostbacks(responses:)`](/documentation/StoreKitTest/SKAdTestSession/flushPostbacks(responses:)).

> Note:
> Ensure that your test server is running and accepting connections before calling ``doc://com.apple.storekittest/documentation/StoreKitTest/SKAdTestSession/flushPostbacks(responses:)``.

---

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