How to change NPC offers

[Tyson12302]

I want the NPC to sell items for a item and not gold coins What do i have to change so he can sell an item for a item that i have?

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {}

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

local shopModule = ShopModule:new()
npcHandler:addModule(shopModule)

 

[Limos]

https://otland.net/threads/npc-remove-gold-nugget-how-to-do.230184/#post-2218930