Hey Guys, could someone tell me how i can say that a item in the cash shop (button cash shop, not the npc one) is a rental item and only last [x] Seconds/Minutes/Hours?
Rental items make use of the rentitem script command (check rentitem on doc/script_commands.txt). They're usually a box that when you open it you'll have that item for some time (time expressed in seconds) and after that it's gone.
I think you can't directly rent items from the Cash Shop but you could take the idea from what it's done on official servers, which is selling boxes that rent you the items when you open them. There are numerous examples on RateMyServer for instance.