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Visa Inc. is an American multinational financial services corporation headquartered in Foster City, California, United States. It facilitates electronic funds transfers throughout the world, most commonly through Visa-branded credit cards, debit cards and prepaid cards. Visa is one of the world's most valuable companies.

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The payment card interchange fee and merchant discount antitrust litigation is a United States class-action lawsuit filed in 2005 by merchants and trade associations against Visa, Mastercard, and numerous financial institutions that issue payment cards. The suit was filed due to price fixing and other allegedly anti-competitive trade practices in the credit card industry. A proposed settlement received preliminary approval from the judge overseeing the case in November 2012 but the majority of named class plaintiffs have objected and many have vowed to opt out of the settlement.

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Visa Plus is a worldwide interbank network that provides cash to Visa cardholders. As a subsidiary of Visa Inc., connects all Visa credit, debit and prepaid cards, as well as ATM cards issued by various banks worldwide bearing the Visa / Electron logo.

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Visa Debit is a major brand of debit card issued by Visa in many countries around the world. Numerous banks and financial institutions issue Visa Debit cards to their customers for access to their bank accounts. In many countries the Visa Debit functionality is often incorporated on the same plastic card that allows access to ATM and any domestic networks like EFTPOS or Interac.

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Visa Electron is a debit card product that uses the Visa payment system. It is offered by issuing banks in every country with the exception of Canada, Australia, Argentina, Ireland and the United States. The difference between Visa Electron and Visa Debit, a similar product, is that payments with Visa Electron require that all the funds be available at the time of transfer, i.e., Visa Electron card accounts may not normally be overdrawn. Visa Debit cards, on the other hand, typically allow transfers exceeding available funds up to a certain limit. For that reason, Visa Electron cards are more commonly issued to younger customers or customers that have poor credit. Some online stores and all offline terminals do not support Visa Electron because their systems cannot check for the availability of funds. In addition to point of sale debit payments, the card also allows the holder to withdraw cash from automated teller machines (ATMs) using the Plus interbank network.