Today's debit and credit cards include a verification or security code. This is a four-digit code printed on the front of American Express cards and a three-digit version on the back of MasterCard ...

With debit transactions forecast to overtake cash purchases by 2012, the model has investors swooning: Visa’s stock traded at $88.14 on Monday, near a 52-week high, while shares of MasterCard ...

Walmart is suing Visa for allowing customers to verify chip-enabled debit card transactions with a signature instead of a PIN. The lawsuit filed Tuesday in New York Supreme Court says that Visa ...