Visa, Mastercard, and AmEx will begin designating gun store purchases
Visa said that it would implement the new merchant code for firearm sales from the International Organization for Standardization.
After ISO made the decision to create a new merchant category code
In accordance with our long-standing policies, we defend all legitimate business transactions on the Visa network.
However, the credit card companies have not provided support for this straightforward, useful, and perhaps life-saving tool.
In contrast to real purchases, merchant codes only keep track of the sort of retailer from which a credit or debit card is used.