Gun Sales At US Stores Could Soon Be Tracked As Visa, Mastercard And American Express Plan To Adopt New ID Code Payment processors have agreed to adopt a merchant code approved by the International Organization for Standardization (ISO) for identifying arms purchases, Reuters reported. The ISO on Friday approved the creation of a merchant code for gun retailers, bowing to pressure from activists who see this as a measure to track suspicious weapons purchases, a separate Reuters report said, citing a spokesperson of the Geneva-based non-profit organization. Previously, gun store sales were categorized as general merchandise. Visa, Inc. (NYSE: V ) reported on Saturday that it would … Full story available on Benzinga.com