Small-business owners have big decisions to make when it comes to how they accept payment -- and investors should be taking note. Along with the traditional setups associated with Visa (V -0.59%) and MasterCard, customers can also pay using their iPhones or Android devices.

Mobile payments are expected to reach the $600 billion mark by sometime next year. Players include Google Wallet, eBay's (EBAY 0.88%) PayPal Here, and Intuit's (INTU -0.53%) GoPayment. But one company drawing a lot of attention is San Francisco-based Square, which will roll out at your local Starbucks (SBUX 0.53%) soon. In the video below, Motley Fool analyst Rex Moore speaks with a local business owner who's sold on Square because of its innovation and low cost.