Creating an unsubscribe link with a Text Block.
To add an Unsubscribe Link to a notification:
add a link to the notification and set the Hyperlink URL to
This will create a link that will disable the notification for the recipient and present them with a "You have been unsubscribed from this notification." message.
If the recipient would like to start receiving the notification again, you will need to be re-enabled it using the Preferences API.