Service Notifications is ideally suited for products that do not have their own server module and require manual intervention. The module is similar to the Auto Release module of WHMCS, but offers further configuration options.
The biggest advantage is, that the admin tickets are not created via the customer account, as in the Auto Release module of WHMCS, but via a customer specified by you, which acts as a bot. This way the customer can not close the ticket created by WHMCS so that you overlook the message.
You can create individual admin notifications with your own text for each product on product creation, suspension, unsuspension and termination.