---------------
-- Client.
---------------
RegisterNetEvent('resource:spawnPed')
AddEventHandler('resource:spawnPed', function(ped)
    local pedhash = GetHashKey(ped)
    RequestModel(pedhash)
    repeat
        Citizen.Wait(10)
    until HasModelLoaded(pedhash)
    SetPlayerModel(PlayerId(), pedhash)
    -- Notification / Chat Message / Whatever.
end)

---------------
-- Server.
---------------
local authList = {
    'steam:id'
}

-- iirc GetPlayerIdentifiers won't return a steam id if they don't have steam running (gta5 not bought thru steam for example).
-- This should be license keys instead since EVERYONE has one (and it's always present) and not every server requires steam to be running to connect.
local function getIdentifier(type, id)
    local identifiers = {}
    local numIdentifiers = GetNumPlayerIdentifiers(id)
    for i = 0, numIdentifiers do
        table.insert(identifiers, GetPlayerIdentifier(id, i))
    end
    for i = 1, #identifiers do
        if string.find(identifiers[i], type, 1) then
            return identifiers[i]
        end
    end
    return false
end

RegisterCommand('setped', function(source, args)
    local src = source
    if args[1] == nil then
        -- Ped arg not present.
        return
    end
    local id = getIdentifier('steam', src)
    if not id then
        -- Chat message or whatever.
        return -- Stop the code from continuing.
    end
    for i = 1, #authList do
        if authList[i] == id then
            TriggerClientEvent('resource:spawnPed', src, args[1])
            return -- Exit the loop.
        end
    end
end)