Requires use of merchant category codes for purchases of firearms and ammunition.

This bill requires payment processors to use a specific international code (established by ISO) for all firearm and ammunition sales by businesses where such sales represent the majority of revenue. It directly affects firearms merchants (like gun stores) and payment networks (such as banks or credit card companies) by mandating this code starting May 2027. The key mechanism is standardizing transaction categorization to improve tracking of firearm-related purchases. The Attorney General enforces compliance, with penalties including $10,000 per violation for non-compliance after a 30-day correction period.