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MasterCard Worldwide principal business is to process payments between the banks of merchants and the card issuing banks or credit unions of the purchasers who use the MasterCard brand debit and credit cards to make purchases. MasterCard Worldwide has been a publicly traded company since 2006. Prior to its initial public offering, MasterCard Worldwide was a membership organization owned by the 25,000+ financial institutions that issue its card. On 8 december 2010, hackers strike at MasterCard to support WikiLeaks.