| Client API | Client-side APIs for game client integration |
| Authentication & Identity | User authentication, account management, and identity services |
| Social Features | Friends, parties, chat, presence, and social interactions |
| Multiplayer & Matchmaking | Session management, matchmaking, dedicated servers, and multiplayer infrastructure |
| Commerce & Monetization | Store, inventory, entitlements, virtual currency, and in-game economy |
| Cloud Save & Storage | Player data persistence, cloud storage, and user-generated content |
| Progression & Engagement | Achievements, statistics, leaderboards, season passes, and player progression |
| Server API | Server-side APIs for dedicated servers and backend services |
| Server Authentication | Server authentication and OAuth2 token management |
| Server Social | Server-side social features and lobby operations |
| Server Multiplayer | Server matchmaking, sessions, and dedicated server management |
| Server Commerce | Server-side commerce and economy operations |
| Server Cloud Save | Server-side cloud save and storage operations |
| Server Progression | Server-side progression, achievements, and statistics |
| Server Analytics | Server-side analytics, telemetry, and metrics |
| Blueprint API | Blueprint-exposed APIs for Unreal Engine visual scripting |
| Data Models | Data structures, request/response models, and DTOs |