Exports and Events

Here is the event and export to use in your scripts to display notifications.

Via export (Client-Side)

exports['PNotif']:sendNotification({
    title = 'Titre de la notification',
    message = 'Message de la notification',
    type = 'success',
    duration = 5000
})

Via Event (Serveur to Client)

TriggerClientEvent('pnotif:sendNotification', playerId, {
    title = 'Titre de la notification',
    message = 'Message de la notification',
    type = 'info',
    duration = 4000
})

Example

RegisterCommand('notifyServerTest', function(source, args, rawCommand)
    TriggerClientEvent('pnotif:sendNotification', source, {
        title = '~r~Titre~s~ ~g~Coloré~s~',
        message = 'Ceci est un test avec ~b~titre coloré~s~ depuis le serveur',
        type = 'success',
        duration = 5000
    })

    TriggerClientEvent('pnotif:sendNotification', source, {
        title = '~y~Attention~s~',
        message = 'Message ~o~important~s~ avec titre ~bold~en gras~s~',
        type = 'warning',
        duration = 5000
    })

    TriggerClientEvent('pnotif:sendNotification', source, {
        title = '~lg~Super~s~ ~bold~Succès~s~',
        message = 'Opération réussie avec ~g~titre en couleur~s~',
        type = 'info',
        duration = 5000
    })
end)

You can always use esx.ShowNotification. If you make any changes in your es_extended, go to the file es_extended/client/functions.lua.

Replace 
ESX.ShowNotification = function(msg)
	SetNotificationTextEntry('STRING')
	AddTextComponentString(msg)
	DrawNotification(0,1)
end

Then, add this.

function ESX.ShowNotification(message, type, data)
    if GetResourceState("PNotif") ~= "missing" then
        local _data = data or {}

        return exports['PNotif']:sendNotification({
            message = message,
            type = type or 'info',
            title = _data.title or 'Notification',
            duration = _data.duration or 4000
        })
    end
end