In fact, it's so easy the Girl Scouts use Sage Mobile Payments to boost cookie sales. They use simple software with a swiper... and so can you.
Requirements: All you need is a mobile device running Android OS 4.4 (KitKat) or iOS 7 or higher.
"The mobile economy is blooming at an even faster rate than expected—by 2017 it will be valued at $3.1 trillion, $200 billion more than the $2.9 trillion Yankee Group forecasted in October 2012."
- Yankee Group