How are missions designed in gta online?

The only verified information available is a general description of Grand Theft Auto Online as an open‑world multiplayer game set in the fictional state of San Andreas. It notes that players can roam the world and engage in cooperative or competitive game modes. No details are given about the design process, structure, or types of missions within the game. Therefore, based solely on the supplied evidence, we cannot describe how missions are designed in GTA Online.