A room where possible test subjects are waiting.
Maybe with some time constrained mini game.
While you are doing research or tending to a test subject, the comm system announces:
"Dr. Fek (or insert players name here) please come to the reception area. Dr. Fek please come to the reception area." And you have one minute left to get dressed and fetch the WELL paying customer. If you come to late, the customer is gone, and the bonus money is lost.
Customer support service by UserEcho