boa tarde, gostaria de saber se tem como fazer o npc, vender os itens por gold ingot q no caso id 9971, mais eu gostaria tipo a pessoa traz 100 gold ingot, compra um item, traz 5000 mil outro e etc ??

<?xml version="1.0" encoding="UTF-8"?>
<npc name="Items Donate" script="data/npc/scripts/itemsdonate.lua" walkinterval="0">
	<health now="100" max="100"/>
	<look type="302" head="58" body="43" legs="38" feet="76" addons="0"/>
	<parameters>
		<parameter key="module_shop" value="1"/>
		<parameter key="shop_buyable" value="Otfun Rod, 7735, 10000000000;Otfun Wand, 6534, 10000000000;Otfun Arrow, 2352, 10000000000;Otfun Club, 7423, 10000000000;Otfun Axe, 7453, 10000000000;Otfun Sword, 7405, 10000000000;up helmet, 8299, 100000000;up armor, 8302, 100000000;up legs,8301,100000000;up boots,8303,100000000;up shield, 8310,100000000;supremmy holy,2270,50000000000;supremmy sd,2263,50000000000;Trap rune,2299,50000000000;Donate Vip,9003,10000000000;"/>
	</parameters>
        <parameters>
                <parameter key="shop_sellable" value="Enfeite Gem,2155,100000000;"/>
        </parameters>
</npc>