A company that processes credit card transactions said Monday that as many as 1.5 million card numbers were compromised in a data breach early last month.
The CEO of the company, Global Payments Inc., said the matter was “absolutely contained,” but Visa dropped the company from its list of approved third parties that process transactions between stores and banks.
The breach was revealed Friday when Visa and MasterCard said they had notified issuers of its credit cards. On Monday, American Express said it may have been affected, and Discover promised to reissue cards where appropriate.
Global Payments set up a website to help cardholders but did not provide the names of affected stores or banks. Its stock fell 4.5 percent on Monday. It fell 9 percent Friday before trading was stopped.
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