Here you can define the web hooks to trigger a re-deploy of the website on your hosting environment. You can define different hooks for 3 different deploy targets (production, staging, development).
For Enterprise plan, you can also provide an Events web hook that will receive a notification for each event of pages (creation, update, delete, etc.), with a proper payload for each type of action. In this way you can implement a logging system or react to actions in an external application.