“Mobile First” and “Mobile Only” are gaining more and more traction as mobile traffic continues to earn an increasing percentage of overall traffic. A recent comScore report showed that consumers now spend 37% of their time online on mobile devices. Tracking and attributing customer engagement on mobile devices can be problematic, especially in native apps where cookies are useless and many traditional methods for tracking individuals activity are rendered ineffective. In iOS, Android and other native app environments, user registration and subsequent login is the most effective way to connect a user in a mobile app to your stored identity and associated data for that user.