A wagering game system is herein. In embodiments, the system's operations can include presenting a primary wagering game and receiving a request to present a secondary game in connection with the primary wagering game. The primary wagering game and the secondary game can be separate applications that require interactivity with each other (e.g., provide required functionality and communicate shared data, etc.). The operations can further include determining that an API provides the required interactivity, so that the secondary game can function in conjunction with the primary wagering game (e.g., can successfully plug-in to the primary wagering game). The operations can further determine optional and non-optional requirements and determine compatibilities based on the optional and non-optional requirements. Further, the operations can add functionality to the primary wagering game, the secondary game, or the API, to enable compatibility.