0.3.6 need help to edit this script

[Teamstem]

Hi, so basically im working on a hig exp server, and i want to make spells which you only can buy after sertant rebirths, so plan is to give the player that rebirthes one item every time they rebirth (alredy works) and for that item i want them to be able to buy custom spells using this script:

local keywordHandler = KeywordHandler:new()

local npcHandler = NpcHandler:new(keywordHandler)

NpcSystem.parseParameters(npcHandler)

function onCreatureAppear(cid)                 npcHandler:onCreatureAppear(cid) end

function onCreatureDisappear(cid)             npcHandler:onCreatureDisappear(cid) end

function onCreatureSay(cid, type, msg)         npcHandler:onCreatureSay(cid, type, msg) end

function onThink()                             npcHandler:onThink() end

function creatureSayCallback(cid, type, msg)

    if(not npcHandler:isFocused(cid)) then

        return false

    end

    local shopWindow = {}

    local spells = {

        {id=1950, buy = 150, name = "Exana Pox", spell = "Andidote", vocations = {1,2,3,4,5,6,7,8}, level = 10},

        {id=1950, buy = 2500, name = "Exori", spell = "Berserk", vocations = {4,8}, level = 35},

        {id=1950, buy = 80, name = "Exiva", spell = "Find Person", vocations = {1,2,3,4,5,6,7,8}, level = 8},

        {id=2182, buy = 5000, name = "Exori Flam", spell = "Flame Strike", vocations = {1,2,5,6}, level = 12},

        {id=1950, buy = 8000, name = "Utito Tempo", spell = "Blood Rage", vocations = {4,8}, level = 60},

        {id=1950, buy = 2000, name = "Exeta Res", spell = "Challenge", vocations = {8}, level = 20},

        {id=1950, buy = 5000, name = "Exori Gran", spell = "Fierce Berserk", vocations = {4,8}, level = 70},

        {id=1950, buy = 500, name = "Utevo Gran Lux", spell = "Great Light", vocations = {1,2,3,4,5,6,7,8}, level = 13},

        {id=1950, buy = 1500, name = "Exori Mas", spell = "Groundshaker", vocations = {4,8}, level = 33},

        {id=1950, buy = 1500, name = "Exana Mort", spell = "Wound Cleansing", vocations = {4,8}, level = 30}

    }

    local onBuy = function(cid, item, subType, amount, ignoreCap, inBackpacks)

    if not getPlayerLearnedInstantSpell(cid, shopWindow[item].Words) then

        if getPlayerLevel(cid) >= shopWindow[item].Level then

            if isInArray(shopWindow[item].Vocs, getPlayerVocation(cid)) then

                doPlayerRemoveMoney(cid, shopWindow[item].Price)

                doPlayerLearnInstantSpell(cid, shopWindow[item].Words)

                npcHandler:say("You have learned " .. shopWindow[item].Words, cid)

            else

                npcHandler:say("This spell is not for your vocation.", cid)

            end

        else

            npcHandler:say("You need to obtain a level of " .. shopWindow[item].Level .. " or higher to be able to learn this spell.", cid)

        end

    else

        npcHandler:say("You already know this spell.", cid)

    end

    return true

end

if msgcontains(msg, 'trade') or msgcontains(msg, 'spells') then

    for var, item in pairs(spells) do

        shopWindow[item.id] = {Level = item.level, Vocs = item.vocations, Price = item.buy, subType = 0, Words = item.spell, SpellName = item.name}

    end

    openShopWindow(cid, spells, onBuy, onSell) end

    return true

end

npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)

npcHandler:addModule(FocusModule:new())

The problem is that i am stuck trying to figure out how i change the money to my item! if anyone could help i would appriciate it alot! thanks!!