I have not used versa pay. I use square, and it appears to be similar to what versa has on their website.
I have been using square since may at our farmers market. The card reader plugs into my android phone (they have apple too) and tracks sales but item or customer. It also allows me to track wholesale accounts to local restaurants. The only fee here in the us is a percentage of Each sale, all in all it was a less expensive way to start accepting cards at the farmers market. Their site is
www.square.com. I hope this is helpful
Kaesfrau