A business card or badge should be as close to flat as is possible.  With the new features I am adding I want to provide convenient connections without adding to the thickness of the assembled board.  A 4mm plated through hole with an oversized pad is ideal for this application.  It is probably the most utilitarian connector you can put on a PCB.  It adds zero height and zero cost, and it works with banana plugs, alligator clip, and screws.  Banana plugs are the perfect connection for a multi-meter.