Webhooks are a clever way of feeding third party applicatiosn information on events in the app. Buddy, for example, utilizes webhooks as a pipeline execution trigger which runs an execution whenever you push something to the integrated repository. You can check the details in the workspace Preferences tab, however it's restricted to workspace admins and owner.
Adding a new webhook
To add a new webhook, you need to paste the payload URL, specify the type of events firing it off (push or execution), and assign it to one or all projects:
Clicking a webhook on the list will bring the edit screen. Here you can modify its details and check the status of the last 20 triggers, including the complete payload: