The unsubscribe URL is a link that, when clicked by the end user, allows them to opt-out of future communications.

From More > Project Settings > Unsubscribe Links, you can configure and customize the unsubscribe link that you can use in your messages.

By default, it's a generic unsubscribe URL provided by the App.

However, you can configure a custom unsubscribe URL, for example, stop.yourbrand.com.

Click on 'Add domain for unsubscribes' and follow the steps provided in how to set up your own URL.

You may also find it interesting to learn how to add the "SMS Unsubscribe" URL in your messages.