Person i hit with my car is trying to screw me for the repair bill , HELP!?

[Bob B]

so i got in a little fender bender and there is no damage that i could see on the persons car, a cop witness the accident and said there was minimal to no damage to the car. i hit the back bumper and now the ladie wants 500 for repairs. im going to ask for recipes of all the stuff but what other options do i have to make sure i dont get screwed out of tons of money !!!!!