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Electronic Payments Practice

Constantine Cannon has unparalleled expertise and worldwide recognition in cases involving the payments industry.  Since the firm’s formation in 1994, we have represented clients concerning virtually every major antitrust development in the payments space.  

This includes litigating every major antitrust case involving Visa, Mastercard and American Express since the 1990s. The firm has represented clients with respect to government investigations, mergers and joint ventures in the industry.  

Our payments industry expertise spans the convergence of fintech and digital commerce and payments.  We are adept at helping large, diverse groups of clients band together in complex cases that require significant time, stamina and legal acumen to plan and win. 

For instance, we serve as counsel for the 7-Eleven Group, the largest of several groups of retailers challenging Visa’s and Mastercard’s Honor All Cards and default interchange rules in a long-running multidistrict litigation.  The 7-Eleven Group includes many of the largest merchants in the United States, including Amazon, Costco, Lowes, Starbucks, Gap, Amtrak, 7-Eleven among many others.

Complex Cases, Major Wins

For millions of retailers, our lawyers secured what was then the largest antitrust settlement in U.S. history in In Re Visa Check/MasterMoney Antitrust Litigation. The case was brought by Walmart and other large retailers on behalf of a certified class of four million retailers that had been forced to accept Visa/MasterCard signature debit transactions at supra-competitive prices. Our work resulted in a monetary settlement of $3.4 billion (then three times the previous largest award) and injunctive relief estimated by the Court at upwards of $87 billion. 

Constantine Cannon also secured what was then the third largest antitrust settlement for client Discover Financial Services, Inc. Discover had sued Visa and MasterCard for damages regarding Visa’s and Mastercard’s enforcement of rules that precluded their bank members from issuing Discover-branded cards. The case resulted in a settlement of $2.75 billion on the eve of trial.

For a group of more than 60 merchants, including both Walmart and Amazon, we successfully objected to the $7.25 billion settlement of the class claims against Visa and Mastercard regarding their Honor All Cards and default interchange rules, among other practices.  That settlement was vacated by the Court of Appeals for the Second Circuit. 

Versatile, Nimble, Experienced

Our payments work extends well beyond the trial and appellate courts. Constantine Cannon regularly represents industry participants, including merchants, fintechs and networks, before federal and state antitrust enforcers and regulators. 

We served as lead counsel for the Merchant Payments Coalition, a coalition of the major merchant trade associations, before the Federal Reserve in connection with regulations adopted per the Dodd-Frank Wall Street Reform and Consumer Protection Act regarding debit card transactions and debit card interchange fees. And we have remained deeply involved in ongoing advocacy for enforcement of debit regulation before the Federal Reserve and the Federal Trade Commission.

Our firm also serves as outside general counsel for the Merchant Advisory Group (the MAG), a payments-focused trade association comprised of more than 150 U.S. merchants and which account for more than $4.8 trillion in annual sales at more than 580,000 locations across the United States and online.

A Leader in Antitrust Issues

Constantine Cannon’s lawyers are thought leaders on issues related to electronic payments. Because of our deep expertise and winning track record, we are routinely asked to speak and write on e-payments developments. Here is a sampling of our articles:

 

Contact us to learn more about our antitrust expertise in electronic payments matters and subscribe to our Payments Blog for news updates and insights.  

 

To keep up with our Antitrust Team, subscribe to our Antitrust Today blog, follow us on LinkedIn & Twitter and listen to our podcast, Antitrust Matters.

 

Payments News Update – June 12, 2026

Posted  06/12/26
Legal and Regulatory Developments SPOTLIGHT: Visa, Mastercard $38 billion swipe fee settlement wins US judge's approval Reuters – June 9, 2026 A U.S. judge on Tuesday granted preliminary approval to Visa's and Mastercard's revised $38 billion settlement with merchants who accused the card networks of charging too much to process payments on their credit cards. U.S. District Judge Brian Cogan in Brooklyn,...

Payments News Update – June 5, 2026

Posted  06/5/26
Legal and Regulatory Developments SPOTLIGHT: Illinois Lawmakers Again Delay Card Fee Law Payments Dive – June 1, 2026 Illinois lawmakers voted to delay until 2027 a state law banning interchange fees on the tax and tip portion of bills, the second one-year delay for a statute mired in litigation. The implementation votes Sunday and early Monday came as the General Assembly wrapped its legislative session,...

Payments News Update – May 29, 2026

Posted  05/29/26
Legal and Regulatory Developments SPOTLIGHT: OCC Aims to Derail State Card Law Payments Dive – May 26, 2026 The Office of the Comptroller of the Currency said Friday in a court brief that a federal judge should block an Illinois law prohibiting interchange fees on the tax and tip portion of bills, adhering to regulators’ preemption of the measure. The OCC issued an interim final order last month to...

Payments News Update – May 22, 2026

Posted  05/22/26
Legal and Regulatory Developments SPOTLIGHT: Crypto Industry Scores Win as Clarity Act Regulation Bill Clears Senate Hurdle CNBC – May 14, 2026 The cryptocurrency industry notched a key win after a Senate panel on Thursday approved the Clarity Act, the first wide-ranging piece of legislation pertaining to the new industry. The Senate banking committee largely voted along party lines, 15-9, with Democratic...

Payments News Update – May 15, 2026

Posted  05/15/26
Legal and Regulatory Developments SPOTLIGHT: Appeals Court Remands Illinois Card Fee Law Payments Dive – May 8, 2026 A federal appeals court on Friday vacated a district court ruling regarding an Illinois law prohibiting interchange fees on the tax and tip portion of bills, arguing that a move by the Trump administration to preempt the law warrants further litigation. The case was remanded to the U.S....

Payments News Update – May 8, 2026

Posted  05/8/26
Legal and Regulatory Developments SPOTLIGHT: Gas Stations Bound to Visa Swipe Fee Deal, 2nd Circ. Says Law360 – May 4, 2026 (subscription required) A Second Circuit panel refused Monday to let a group of gas stations separately sue Visa and Mastercard over their swipe fees, holding the would-be plaintiffs cannot get out of a $5.6 billion antitrust settlement the credit card giants inked with merchants. The...

Payments News Update – April 24, 2026

Posted  04/24/26
Legal and Regulatory Developments SPOTLIGHT: Congress Moves to Give FinTechs Direct Fed Payment Access With PACE Bill PYMNTS – April 22, 2026 The future of payments infrastructure may hinge less on technology than on who is permitted to connect to it. Legislation introduced in the U.S. House this week, known as the Payments Access and Consumer Efficiency Act (PACE Act), would establish a federal...

Payments News Update – April 17, 2026

Posted  04/17/26
Legal and Regulatory Developments SPOTLIGHT: OCC Plans to Preempt Illinois Interchange Law Payments Dive – April 16, 2026 The Trump administration is considering an executive order to preempt the Illinois Interchange Fee Prohibition Act that is set to take effect in July. That’s according to a submission Tuesday from the Office of the Comptroller of the Currency, which is part of the Treasury Department,...

Payments News Update – April 10, 2026

Posted  04/10/26
Legal and Regulatory Developments SPOTLIGHT: Illinois AG Defends Card Fee Law Payments Dive – April 7, 2026 An Illinois law that prohibits interchange levies on sales tax and gratuities doesn’t interfere with banks’ or card networks’ ability to set fees, the state’s attorney general said Friday in defending the law before an appellate court. The Illinois Interchange Fee Prohibition Act isn’t...
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