Try now:
I changed the coin to item ID 26080
NPC Trader:
prontera,136,217,4 script Coin Trader 4_M_MANAGER,{
.@npc$ = "[Coin Trader]"; //NPC Name
mes .@npc$;
mes "Hello. I'm the Coin Trader";
mes "I can trade Zeny for Coin and vice versa";
mes "(1 Coin = 10.000.000z)";
mes "What you want trade?";
next;
menu "Zeny for Coins",zc,"Coins for Zeny",cz,"Close",cl;
cl:
close;
zc:
mes .@npc$;
mes "How many Coins do you want purchase?";
mes "(1 Coin = 10.000.000z)";
input @zc;
@qnt = @zc*10000000;
if (Zeny - @qnt < 0){
mes "Do you not have zeny";
close;
}
getitem 26080,@zc;
set Zeny,Zeny - @qnt;
mes " ";
mes "Thank You!";
mes "(Now do you have "+countitem(26080)+" Coin(s) )";
close;
cz:
mes .@npc$;
mes "How many Coins you want sell?";
mes "Do you have "+countitem(26080)+" Coin(s)";
mes "(1 Coin = 10.000.000z)";
input @cz;
@qnt = @cz*10000000;
if (countitem(26080) - @cz < 0)
{
mes "Do you not have sufficient Coins";
close;
}
if (Zeny + @qnt > 2000000000){
mes "Do you can't stay more than 2b Zeny";
close;
}
delitem 26080,@zc;
set Zeny,Zeny + @qnt;
mes " ";
mes "Thank You!";
mes "(Now do you have "+countitem(26080)+" Coin(s) )";
close;
}
Coin Shop:
prontera,141,217,4 script Coin Shop 4_F_TELEPORTER,{
mes "[Coin Shop]";
mes "Hello. Why do you want buy with yours Coins?";
mes "(Do you have "+countitem(26080)+" Coin(s) )";
menu "Red Potion (3 Coins)",rp,"Knife[4] (7 Coins)",kn,"Cancell",cl;
cl:
close;
rp:
if (countitem(26080) - 3 < 0)
{
mes "Do you not have sufficient Coins";
close;
}
delitem 26080,3;
getitem 501,1;
mes " ";
mes "Thank You!";
mes "(Now do you have "+countitem(26080)+" Coin(s) )";
close;
kn:
if (countitem(26080) - 7 < 0)
{
mes "Do you not have sufficient Coins";
close;
}
delitem 26080,7;
getitem 1202,1;
mes " ";
mes "Thank You!";
mes "(Now do you have "+countitem(26080)+" Coin(s) )";
close;
}