There was a hack to make $5 bills get credited as $100 bills. It was on the JCM WBA-22/23 bill validator model used in slot machines. You needed a small screwdr

There was a hack to make $5 bills get credited as $100 bills. It was on the JCM WBA-22/23 bill validator model used in slot machines. You needed a small screwdriver a wire and a battery. Stick it between the door bezel and under the BV then short two pins and insert the $5 bill. All while avoiding surveillance of course. The fix was to cover the IC with anti-static black cardboard.