Cool idea or nut-job opportunity for abuse? This lets you "dip" your credit card to tip, if you don't have cash or like to keep every nickel on plastic, at places with counter staff, where more people these days pay with plastic and don't have to sign receipts. Operators set it for a certain amount per swipe, such as $1; if you want to tip $2, you swipe twice.
Further explanation here.
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