How does the gta online heist system work?

The only verified evidence supplied is a general description of Grand Theft Auto Online, covering its release dates, platform availability, and overall gameplay elements such as allowing up to 30 players to explore the open world of San Andreas. This description does not mention heists or any specific multiplayer missions or systems related to them. Therefore, based on the available evidence, we cannot describe how the heist system works in GTA Online.