Visa Inc., the world’s largest payments network, said it will provide documents to the U.S. Federal Trade Commission after the agency asked for information on a debit-card service that may have violated the Durbin amendment.

U.S. antitrust regulators asked Visa in a Sept. 21 letter to voluntarily hand over documents related to its PIN Debit Gateway Service, the Foster City, Calif.-based company said today in a filing. Visa said it’s cooperating with the U.S. and responding to its requests for information, and that the revenue in question isn’t material.

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