doTransformItem(item.uid, item.itemid + 1)
If item.itemid is 2160(Crystal Coin ID) then it will be transformed to +1, so it will be 2161.
(item.uid, item.itemid + 1)
item.uid is a param, the item you are manipulating. item.itemid + 1 is the second param, tells what i wrote above
If you have...