Courier deliveries are smuggling missions: you pick up illegal goods at a distant location and smuggle them into the current city. A warrant will be issued for your arrest for smuggling goods and the police will attempt to prevent you from delivering the illegal items.
As a civilian, you can begin a courier mission by typing /courier. The pickup location is always far away from the city and the delivery destination is always in the city. You have 12 game hours to complete a courier delivery, and you receive an extra bonus based on distance and time when you complete a delivery. You can use any type of vehicle for courier deliveries.
Press the Sub-Mission Key or type /mission at any time during a courier delivery to get information about your current delivery or pickup.
Type /cancel at any time during a courier delivery to cancel the current mission.