What are Ubisoft Club Units?
Ubisoft Club Units are like points or tokens, which you earn by successfully completing Challenges in Uplay enabled games. Once earned, you can use your Ubisoft Club Units to claim exclusive, free Rewards from any of the Uplay enabled games, on any platform (PC (Microsoft Windows), PlayStation 4 (PS4), Xbox One, Mobile (iOS & Android), Nintendo Switch, Linux, and OS X).

Can player use Ubisoft Club Units to buy items on the Ubisoft Store?
Ubisoft Club Units are part of Actions and Rewards systems in Ubisoft game, which is the Uplay Coupons in-game. Player can earn Ubisoft Club Units by completing Actions in his games, or directly Buy Uplay Promo Code from Joymmo.com online virtual currencies store. Points can then be redeemed for Rewards in games that player own. Player can't purchase items on the Ubisoft Store directly with Uplay Club Units, but player can exchange it for a store discount! Please note that Ubisoft Store discount codes are not valid for in-game currency purchases and may not work in conjunction with existing offers, discounts, or with other codes.