Fills the tooltip with information about an alternate currency required to purchase an item from a vendor. Only applies to item-based currencies, not honor or arena points.
Signature:
GameTooltip:SetMerchantCostItem(index, currency)
Arguments:
index- Index of an item in the vendor's listing (between 1 andGetMerchantNumItems()) (number)currency- Index of one of the item currencies required to purchase the item (between 1 andselect(3,GetMerchantItemCostInfo(index))) (number)