Relating to: prohibiting firearms merchant category codes in payment card transactions, prohibiting government lists of firearm owners, and providing a penalty.

This Wisconsin bill prohibits payment card networks and issuers from requiring firearms retailers to use a specific merchant category code that distinguishes them from general merchandise or sporting goods stores. It also bans state and local governments from intentionally creating or maintaining lists of individuals who own firearms, with limited exceptions for criminal investigations or court orders. The legislation establishes penalties for violations, including the authority for the attorney general to investigate and order non-compliant entities to stop using prohibited codes within 30 days. Although the bill passed the legislature, it was vetoed by the Governor and did not become law.