With technology changing rapidly I am looking for a solution to take payment for goods and services via credit card through my smart phone. Many small time operators have been using Square Reader for their point of purchase reader and my main concern is their policy of not allowing purchases of guns and ammunition. I support the Second Amendment and I don't want to use Square Reader if there are better alternatives out there. Square Reader takes 2.75% per transaction as well. Does anyone use another reader with a better constitutional record and/or lower fees?