I have square up. IT ROCKS! It charges you 2.75% no matter what the card is(AMX, VISA, MC, Discover). I love bringing my free card reader and invoice and swiping my clients card at the end of the shoot! I get the $$ in about 2 days. ***IF YOU DO NOT SWIPE THE CARD IT WILL TAKE 30 DAYS TO GET $$(when you type in the number without card)..
https://squareup.com/