cfx-server-data/resources/[gameplay]/playernames/playernames_sv.lua

local curTemplate
local curTags = {}

local activePlayers = {}

local function detectUpdates()
    SetTimeout(500, detectUpdates)

    local template = GetConvar('playerNames_template', '[{{id}}] {{name}}')
    
    if curTemplate ~= template then
        setNameTemplate(-1, template)

        curTemplate = template
    end

    template = GetConvar('playerNames_svTemplate', '[{{id}}] {{name}}')

    for v, _ in pairs(activePlayers) do
        local newTag = formatPlayerNameTag(v, template)
        if newTag ~= curTags[v] then
            setName(v, newTag)
            
            curTags[v] = newTag
        end
    end

    for i, tag in pairs(curTags) do
        if not activePlayers[i] then
            curTags[i] = nil -- in case curTags doesnt get cleared when the player left, clear it now.
        end
    end
end

AddEventHandler('playerDropped', function()
    curTags[source] = nil
    activePlayers[source] = nil
end)

RegisterNetEvent('playernames:init')
AddEventHandler('playernames:init', function()
    reconfigure(source)
    activePlayers[source] = true
end)

detectUpdates()