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# additionalValue(forKey:)

Returns the object associated with the key.

```
func additionalValue(forKey key: String) -> Any?
```

## Parameters

`key`

The string that identifies an additional value.

## Return Value

The associated value of the key.

## Discussion

Additional values are values you use to verify and associate an app installation with an ad campaign. For more information, see [`SKAdNetwork`](/documentation/StoreKit/SKAdNetwork).

---

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