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# containerAppLaunchRequestIDKey

A key the container app uses to retrieve a unique identifier for the live assistance request.

```
static let containerAppLaunchRequestIDKey: String
```

## Discussion

When launched with the user activity type [`containerAppLaunchReasonKey`](/documentation/LiveCommunicationKit/LiveAssistance/containerAppLaunchReasonKey), your app retrieves this key from the <doc://com.apple.documentation/documentation/Foundation/NSUserActivity/userInfo> dictionary of the <doc://com.apple.documentation/documentation/Foundation/NSUserActivity> received by the launch method. After your container app finishes performing sign-in or collecting any needed information from the person using the service, your app sends the request id to [`returnToCall(requestID:)`](/documentation/LiveCommunicationKit/LiveAssistance/returnToCall(requestID:)) to return to the FaceTime call and allow your app extension to finish setting up the live assistance service.

---

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