Is there a reason why there are no Sell Inventory Items?
It would be very helpful if you could store a sell price in the item. The call should then remove the item from the player inventory and give the player the stored currency.
Probably, a exchagen function would be even better:
Exchange Inventory Item
It would be cool if an item gets an exchange area. Here you can specify items that are needed to make an exchange. Exchange Items: 3x Item A 5x Item B
Exchange Result: 1x Item C