Notifications
Each time you click the bell on a task to notify a user, a notification is sent.
Recurring cases are handled by a background screen. Every day at 2am, the script creates a notification for each recurring case, for all the users involved.
Screen
To open the screen, for example to debug it:
screen -r fcm
Modules
You can notify users through modules, such as email or Matrix. Here is an example.
If your own module needs parameters, set them in config_module.py.