Amazon Builds Brick-and-Mortar Presence With Card-Swiping Device

Amazon.com unveiled a credit card reader and mobile app for brick-and-mortar businesses on Wednesday, marking the latest step by the U.S. online retailer to expand its presence in the physical world. The move pits Amazon against a slew of rivals, including startup Square, which popularized a payments dongle that allowed small and midsized businesses like food trucks, coffee shops and personal trainers to quickly accept credit and debit cards.