Visa Inc filed a lawsuit against Wal-Mart Stores Inc on June 29, claiming the retailer secretly began testing a protocol that eliminated the need for signature verifications for transactions paid for with a Visa debit card.
The lawsuit comes about a month after Wal-Mart had sued Visa saying the payments network operator was resisting the use of personal identification numbers (PINs) by customers for purchases made on debit cards at Walmart stores.
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