you will need pictures of the station from afar two views of the main sign, an overall view of the station. two views of the canopy from opposite sides but you meed all sides in the pictures. a pix of the pumps and pix of any problems that you find. Two receipts one from the pump that is paid at the pump and one from inside that you paid cash for if less than $5. Need the name of the clerk/attendant how many are on duty in uniform, And other stuff. I would recommend that you do at least one. See if you like it. The Audits are more involved than the mystery shop but they are not all that bad. They even give you a cheat sheet in the paperwork. Sometimes they change from one location to the other and usually from one at the same location a few months later.
In my opinion they aren't worth the 8-10 offered in my area.