# authorizationCallback A callback function that obtains a token. ``` authorizationCallback?: (this: null, done: (token: string) => void) => void; ``` ## Parameters `done` A function that completes the MapKit JS token request, called after creating a new token. ## Discussion MapKit JS asyncronously invokes the `authorizationCallback` function throughout a session to obtain new authorization tokens. In the callback, you create a token and pass it to the function that MapKit JS provides in the `done` parameter. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)