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# UNNotificationDefaultActionIdentifier

An action that indicates the user opened the app from the notification interface.

```
let UNNotificationDefaultActionIdentifier: String
```

## Discussion

The delivery of this action doesn’t require any special configuration of notification categories. Use the [`userNotificationCenter(_:didReceive:withCompletionHandler:)`](/documentation/UserNotifications/UNUserNotificationCenterDelegate/userNotificationCenter(_:didReceive:withCompletionHandler:)) method of your delegate object to receive this action.

---

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