Coin Operator is a special perk in the Fallout: New Vegas add-on Dead Money. It is received from Christine as part of her dialogue: several Perception and Intelligence checks are necessary, along with polite responses. To get the proper line of dialogue, you need to ask her if she knows what the machines around the Villa are for. A dialogue option to acquire this perk has a Perception check of 6 followed by an Intelligence check of 6.