E-commerce merchant Mitch Goldstone filed the interchange antitrust lawsuit back in 2005.
Credit cards still remain the most profitable loan product in the portfolio.
Plantiffs also say the sheer size of the debit card market make their case big enough for the nation's highest court.
Last year's lawsuit against the Federal Reserve could be heard by the Supreme Court.
Digital wallets could compromise a credit union's interchange income.
Read why take-up of mobile payments matters, and access a Filene report exclusive to CU Times readers.
Credit unions wondering if the courts would make them change their debit card programs can rest easy for now.
After the Fed's current interchange rule was upheld in court, plaintiff retailers say they may appeal to the Supreme Court.
After nine months of uncertainty regarding the minimum number of required debit networks and other details, the Fed's rule will not change.
A three-judge panel may wind up preserving the Fed's debit interchange regulation, which a lower court invalidated last year.