Rockstar Games Social Club
Rockstar's online authentication and player-services backbone originally launched in 2008 to back GTA IV and later every major Rockstar title. Provides player accounts, friends, Crews, multiplayer matchmaking, achievements/awards, job sharing, Snapmatic photos, and the GTA Online / Red Dead Online stat back-ends. Per Wikipedia, "Most branding relating to Social Club was removed from Rockstar's website by November 2023" — the service has been folded into the unified Rockstar Games account, though its internal HTTP APIs (commonly observed under scapi.rockstargames.com and prod.cloud.rockstargames.com) continue to power live-service titles. No public developer documentation or third-party client credentials are offered.