Top New York City and California pension officials want payments processors Visa Inc, Mastercard Inc and American Express to create a new tool to track suspicious gun purchases.

Staff for New York City Comptroller Brad Lander, who oversees pension funds, said he has filed shareholder resolutions at Mastercard and American Express asking their boards to explain their views on whether to add a new “merchant category code” for firearms stores.

Lander and a California State Teachers’ Retirement System portfolio manager made a similar request to Visa, whose deadline for 2023 shareholder proposals has passed.

In Aug. 29 letters to the three companies seen by Reuters, the pension officials wrote such codes would help financial firms meet obligations to report suspicious purchases, and noted the four-digit codes are already assigned to specialized businesses like bowling alleys.

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Currently, “banks and payment networks cannot readily identify sales made by standalone gun and ammunition retailers,” the officials wrote.

A Mastercard representative said it is reviewing the issue and that it aims to support “all legal purchases while protecting the privacy and decisions of individual cardholders.”

Representatives for Visa and American Express did not immediately comment.

U.S. gun-rights activists say new codes could open the door to unauthorized police surveillance. An international standards body would implement code changes.

New York City Mayor Eric Adams, with representatives on pension fund boards, supports calls for the new codes, a representative said.

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