showAdvancedNotification
TriggerClientEvent('esx:showAdvancedNotification', source, title, subject, msg, icon, iconType)
This event shows a notification for the specified source. This is what you'll want to use server side when you want to send a notification.
Example
TriggerClientEvent('esx:showAdvancedNotification', source, 'title', 'subject', 'msg', 'CHAR_AMMUNATION', 3)
Result
Note
Do not use this event for client side, instead use ESX.ShowAdvancedNotification