For added protection, assuming you go with something mentioned in this thread, use your phone/camera to record all credit/debit card purchases. As they hold the card(s) in clear view, have each buyer look into the camera and (hopefully happily) say what they are buying and for how much, etc. That would be a nice piece of evidence to have if anyone ever tries to screw you over later. Plus, it would probably act as a deterrent to someone thinking they could pull a fast one on you.
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