By default, the Unsubscribe Vendor is set to Manual in your Third Party Integration Settings. This means that your CAKE instance will not be integrated with a 3rd party vendor.

CAKE does have an integration with 3 Unsubscribe Vendors:

1. Optizmo
2. UnsubCentral
3. Ezepo

-CAKE will require an Optizmo ONID if Optizmo is the vendor. This will be provided by Optizmo.

-CAKE will require an API URL and a Parent Hash if UnsubCentral is the vendor. This will be provided by UnsubCentral.

-CAKE will require an API URL and an API Key if Ezepo is the vendor. This will be provided by Ezepo