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SALINAS CA/USA - APRIL 8, 2014: Walmart store exterior. Walmart is an American multinational corporation that runs large discount stores and is the world's largest public corporation.

Walmart Sues Visa Over Signature Requirements

Walmart is once again battling the payment card industry. In October, it criticized the new EMV cards, alleging they would lead to longer holiday shopping lines. On Tuesday, the retail giant sued Visa in New York. Walmart wants to require customers to use their personal identification numbers (PINs) at terminals when they are using their