If you want to enable Slack notifications for the WAF.
Edit the file
config.php add the following line
$_config['fw_slack_is_active'] = 'yes'; then save!
When done you will be see a new section in Backoffice > Settings > Advanced > Firewall
Simply fill it with your Webhook URL, Channel & Username then save!
Every Firewall alert will trigger a notification in your subsequent Slack channel!