L2J Server

I saw on a nother server that when u make there a private store ucan buy items from players not for adena but for another item like medal or something like that. How can I make this on my server too? Where i have to change this? That player can buy from others player private store for chokolate cookies and not for adena?

have you even tried searching? warning issued because of this and the other post. search before posting and do not request just anything. follow the forum rules. thanks.