If you have any third-party integrations which you would like to sync with AT, for example: Zoho CRM or Mailchimp or any such platform, then the webhook has to be set for the AT records to be passed to the third-party software. If Zoho is the third-party tool, then you might get the webhook URL and secret from the Zoho support team and add it here in the appropriate fields. Choose the required action when an API call has to be made to the third party from AT. Say for example, if you choose subscription creation as the event, then whenever a subscription is created in AT, a call would be automatically made to Zoho and the created subscription entry would be updated on Zoho CRM. From the third-party tool, we could set up any workflow like sending out welcome emails/ subscription activation emails as per our requirement.