There have been a couple published adventures with merc tickets but I don't have them anymore.
As a guideline for T20 I might go with the base ship crew salary structure (p 347) appropriate to the task and adjusted like the cargo types (p 356). Five times the base for security type work (look tough but no danger) and ten times the base for hazardous duty (there will be some shooting involved).
eg.1 - Hired to chauffeur dignitary around to see how bad the place has gotten - Class it as Boat Pilot, Security work, making it cr2,000 base times five = cr10,000 per month, but its only a one week gig so cr2,500 final.
eg.2 - Pilot a ship through a blockade to deliver urgently needed supplies - Class it as Pilot, Hazardous duty, making it cr5,000 base times ten = cr50,000 per month, but rated as one week hazardous while in system and two weeks standard while in jump so actually cr15,000 for the trip.