Close out to a Smart Bill Folio tender type. What you don't do? Do NOT wait for them to drop credit card. Do NOT pick up credit card. Do NOT walk card to POS. Do not swipe or dip card. Do NOT print out CC signature paper. Do NOT walk paper and pen over to POS.
Do NOT make guest calculate tip with a pen. Do NOT try to decypher their writing. Do NOT get smaller tips because a customer mis-estimated tips.