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# signature

The key-value pairs that ad networks use to cryptographically sign a web ad.

```
object signature
```

## Discussion

Use the required parameters in the [`signature`](/documentation/SKAdNetworkforWebAds/signature) object to generate a cryptographic signature for the [`AdImpressionResponse`](/documentation/SKAdNetworkforWebAds/AdImpressionResponse). For more information, see [Generating a signature for attributable web ads](/documentation/SKAdNetworkforWebAds/generating-a-signature-for-attributable-web-ads).

---

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