The House passed legislation blocking the use of merchant category codes (MCCs) designed to track firearm retailer transactions, shutting down a regulatory approach states have begun adopting independently.
The measure prevents the International Organization for Standardization and payment processors from creating specialized codes that isolate gun store purchases from broader retail categories. This blocks a technique that gun control advocates had championed as a way to flag suspicious buying patterns, such as bulk purchases that might signal illegal firearms trafficking or straw purchases destined for criminals.
Several states, including New York and California, had pushed for MCCs as an alternative to direct regulation. By isolating gun retailer transactions, payment networks like Visa and Mastercard could theoretically monitor for red flags and report concerns to law enforcement. The codes would have applied universally, affecting all firearms sales regardless of legality.
Gun rights advocates framed the bill as a privacy protection measure. They argued that merchant codes would unfairly single out the firearms industry and create surveillance infrastructure for lawful purchases. The National Rifle Association and allied groups backed the legislation.
Payment processors had grown increasingly caught between state regulators demanding action and merchant associations resisting the codes. Visa, Mastercard, and American Express had each faced pressure to implement MCCs, with some state attorneys general threatening enforcement action. The House bill preempts this fractured regulatory landscape by establishing a federal prohibition.
The Senate has not yet voted on the measure. If enacted, it would represent a rare legislative victory for the gun industry on a regulatory front where anti-gun groups had gained recent traction. Payment processors had shown willingness to adopt tracking codes under state pressure, making the House action an effort to prevent a de facto national standard through state-by-state adoption.
The bill carries broader implications for payment processor autonomy. Banks and card networks operate under federal oversight but increasingly face state-level demands to police transactions in industries from firearms to fossil fuels. The House action signals congressional unwillingness to allow state fragmentation on payment system architecture.
Investors tracking payment processors and financial services should monitor Senate action on this bill and broader regulatory pressure on Visa (V), Mastercard (MA), and American Express (AXP) to enforce merchant category standards.