PMI runs every year a large promotion with prizes for Marlboro clients where users are sending promo codes by sms or web site. As their goal was to increase the users engagement we deployed a first version of the app where users can earn points that could be used in supporting new projects for a better live. The second version of the app (Make Change II) added more engagement by proposing different challenges to the users. The technical challenge was to integrate 3 different API from the 3 partners, each of them in charge with only a part of the app back end.