Method: Get an array of LifterLMS Admin Page settings to send test notifications

Method: Determine if the notification is a potential duplicate

Method: Determine if the notification type support tests

Method: Send all the subscriptions

Method: Send a notification for a subscriber

Method: Send a test notification to the currently logged in users Extending classes should redefine this in order to properly setup the controller with post_id and user_id data

Method: Determine what types are supported Extending classes can override this function in order to add or remove support 3rd parties should add support via filter on $this->get_supported_types()

Method: Subscribe a user to a notification type

Method: Takes a subscriber type (student, author, etc) and retrieves a User ID