client.lua

function openGui(color,message,time)
    guiEnabled = true
    SendNUIMessage({runProgress = true, colorsent = color, textsent = message, fadesent = time})
end

function closeGui()
    guiEnabled = false
    SendNUIMessage({closeProgress = true})
end

RegisterNetEvent("notifications:sendNotification")
AddEventHandler("notifications:sendNotification", function(color,message,time)
    openGui(color,message,time)
end)

RegisterNetEvent("notifications:closeUI")
AddEventHandler("notifications:closeUI", function()
    closeGui()
end)


RegisterCommand('testnotfy', function(source, args, raw)
    local color = 1 -- success
    local msg = 'Test notification from QB Notify'
    local time = 5000


    if args and #args > 0 then
        local n = tonumber(args[1])
        if n then color = n end
        if #args > 1 then
            msg = table.concat(args, ' ', 2)
        end
    end

    openGui(color, msg, time)
end, false)