To access the last public note added to a ticket using webhooks, you can use the placeholder {{ticket.latest_public_comment}} in the webhook payload. When the webhook is triggered, this placeholder will be replaced with the last public note added to the ticket, and the resulting payload will include this information.

Accessing the last added public note to a ticket via webhook
For example, if you use a webhook to send notifications to a Slack channel whenever a public note is added to a ticket, you can include the placeholder {{ticket.latest_public_comment}} in the payload to ensure that the last public note is included in the notification. 

This way, your team can stay current on the latest developments in Freshservice without switching back and forth between systems.