You need to own the Agency to do this mission.
Security Contracts are quick missions. There are 6 different missions. This have only a base payout. the only one Asset Protection is every crates that get destroyed you will loss the amount of money that you can earn
There is a passive income between $250-$20.000 per GTA day (48 minutes) This is based on Security Contracts for every 5 Security Contracts the amount will be increased with $500 only not the first 5 then you will get $500. Example you have done 30 Security Contracts then you will get $3.000 per GTA day (48 minutes).
You need to protect the crates.
There are enemies with red arrows above their head these are the enemies that can destroy the crates.
How to make asset protection security contract missions very easy Gta Online
Go to the location and then you need to kill the 4 gang member they have a red arrow above their head. (recommended use the Armored Kuruma.)
GTA Online: "Gang Termination" Security Contract Guide (SOLO)
First you need to follow an vehicle and does not been Detected. After it in a building you need to shoot some enemies and destroy their product. after it run for the police.
2xGTA$ | Security Contract | Liquidize Assets Guide
Go to the location and kill them inside the building. locate the safe. Find the safe codes. Take the valuable in the Safe and bring it back to the Agency.
Gta 5 Safe Combination Tequi la la Security Contract Recover Valuables
You need to rescue your client. first kill all enemies. Then take your client to your vehicle and bring him back to the safe house.
Agency Security Contract Rescue Operation GTA 5 Online
You need to recover a vehicle of a client. Go to the location and kill all persons inside the building. first put on the button that open the exit and then drive with the vehicle out of the building and back to your agency.
Security contracts Vehicle recovery LSIA fast & easy, Agency gtaonline