With mobile point-of-sale adoption growing slowly, PayPal, Square and Groupon are each making a bigger bid for presence in traditional point-of-sale retail locations. "These companies are now looking to expand their market by offering not only the simple and inexpensive models to micro-merchants, but also models that contain additional features and capabilities which slightly larger merchants would be willing to pay extra for," said David Kaminsky, emerging technologies analyst at Mercator Advisory Group.

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