Wal-Mart Stores Inc. sued Visa Inc.’s U.S. unit, saying the company wants the retailer to use a less-secure method for verifying debit cards in order to route transactions through its own networks.

Wal-Mart filed a heavily redacted complaint in New York state court on Tuesday claiming that Visa U.S.A. wants it to verify transactions made with certain debit cards with signatures rather than the chip-and-PIN protocol.

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