Startup Square gets a caffeine boost by providing mobile payments for Starbucks customers. The deal also includes credit card processing.

Paypal, the world's largest online payment processor, offers a new service to real-world merchants. What does this mean for rival Square?

Everyone needs enormous piles of cash, evidently.

Big day for Square

Armed with a smartphone and a special app from Square, fundraisers can collect credit card donations on the spot.

Many small businesses are still on the wrong side of the Digital Divide

Buying and selling is getting a whole lot more mobile….