Recent enforcement actions and guidance suggest that U.S. banking examiners are ratcheting up their scrutiny of how banks monitor payment processors for anti-money laundering risks. In April, the U.S. Office of the Comptroller of the Currency ordered Charlotte, N.C.-based Wachovia Corp. to pay a $10 million penalty and compensate victims of a fraud involving a payment processor as much as $125 million. The case involved telemarketers pressuring elderly citizens for account information from their paper checks. They were then using that information to generate a "remotely created check" transaction, where the paper check is turned into an electronic transaction. Regulators...