create a user segment and study the behavior of the users later on. For example, you can save a segment of users who make payments in Application A, but don’t pay in Application B. After that, using the created segment, you can study user behavior in detail: what offers motivate users to buy in Application A, what goods they buy there, what amount of money they spend. Perhaps the prices in Application A are lower than in Application B, or in Application A you can buy goods for customizing your game character, while in Application B there are no such goods. After analyzing the paying audience of your application you can develop hypotheses for A/B testing, as well as start sending push notifications with appealing offers to potential paying audience.