The notification is based on a command which will be executed by the scheduler when the notification is issued. This command is attached to each contact to be notified. Centreon has default commands that you can modify.
Go to the configuration commands chapter to edit / add new notification commands.
You can also find in the Centreon plugins to send preformated HTML email, etc. You must install the plugin on all pollers, add a command to use this plugin and change the command of yourf contacts.
A Centreon-Chatops community project has been develop to allows communication between a Team chat like Mattermost or Slack and Centreon throught slash command
You can also forward event to a third party application using the Centreon Stream Connector functionality.
See the Intregration / Stream-Connectors chapter.