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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 – January 23, 2026

Posted  01/23/26
Legal and Regulatory Developments SPOTLIGHT: White House Weighs Executive Action to Cap Credit Card Rates Bloomberg – January 16, 2026 (subscription may be required) The White House is weighing an executive action to enact President Donald Trump’s call for a cap on credit card interest rates, in addition to other measures seeking to ease US affordability challenges. The plan, which is still being crafted...

Payments News Update – January 9, 2026

Posted  01/9/26
Legal and Regulatory Developments SPOTLIGHT: How Payments Will Evolve: 6 Industry Trends to Watch in 2026 Payments Dive – January 6, 2026 The payments industry has been evolving at a dizzying pace in recent years, and that’s not expected to let up this year. Industry change is likely to revolve around regulatory dynamics in 2026. On the federal front, regulators will assert new authority in creating a...

Payments News Update – December 26, 2025

Posted  12/26/25
Legal and Regulatory Developments SPOTLIGHT: Fed Report Shows Visa, Mastercard Shift More Debit Card Fraud Onto Merchants CPA Practice Advisor – December 22, 2025 A new report from the Federal Reserve shows that Visa and Mastercard shifted more of the burden of debit card fraud onto the merchants, while easing responsibility for banks. The updated figures for 2023 show that merchants paid for 49.9% of debit...

Payments News Update – December 19, 2025

Posted  12/19/25
Legal and Regulatory Developments SPOTLIGHT: Walmart, Other Retailers Object to Visa and Mastercard Settlement Reuters – December 15, 2025 Major retailers and trade groups are urging a federal judge in Brooklyn to reject a proposed antitrust settlement with Visa and Mastercard, saying the deal lets the card giants keep charging merchants excessive fees for credit card transactions and offers them few...

Payments News Update – December 12, 2025

Posted  12/12/25
Legal and Regulatory Developments SPOTLIGHT: Amex Inks Deal After $12M Antisteering Rule Verdict in NY Law360 – December 9, 2025 (subscription required) American Express Co. has reached a settlement with consumers who claim the credit card company's so-called antisteering rules cause non-Amex cardholders to pay higher charges, signaling a potential end to a class action suit after a New York federal jury...

Payments News Update – December 5, 2025

Posted  12/5/25
Legal and Regulatory Developments SPOTLIGHT: Digital Wallet Use Outpaces Regulators Payments Dive – December 3, 2025 Back in 1999, eight years before Apple’s first iPhone release, a Silicon Valley software startup named Confinity introduced what it called a new “killer app.” It was dubbed PayPal.com. The service allowed the “beaming” of funds between users, with only an email address. “Beaming...

Payments News Update – November 28, 2025

Posted  11/28/25
Legal and Regulatory Developments SPOTLIGHT: Visa Finds Even $200 Billion Can’t Resolve Battle With Merchants Bloomberg – November 21, 2025 (subscription may be required) Nine years ago, the $5.7 billion sticker price to settle one of the biggest class-action lawsuits ever was rejected. Last year, it climbed to $30 billion, just to be thrown out again. Now, it’s north of $200 billion, and there’s...

Payments News Update – November 21, 2025

Posted  11/21/25
Legal and Regulatory Developments SPOTLIGHT: ‘Not the Final Chapter:’ Questions Arise About the Latest Interchange Settlement Digital Transactions News – November 14, 2025 As the dust settles around the latest settlement agreement in Visa Inc.’s and Mastercard Inc.’s long running legal battle with merchants over card-acceptance fees, how the offer will impact the payments industry is coming into...

Payments News Update – November 14, 2025

Posted  11/14/25
Legal and Regulatory Developments SPOTLIGHT: Visa, Mastercard Reach Legal Pact With Merchants Payments Dive – November 10, 2025 Visa and Mastercard have agreed to end their longstanding “honor all cards” rule and temporarily lower interchange fees as part of a settlement agreement announced Monday that could conclude 20 years of litigation over how much merchants pay the card networks and banks. Under...
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