[hga]

I don't completely buy it. Your proscribed list includes "(49) weapons and munitions", yet at least in the US, outside of a few slave states, there's no regulation of ammunition once it's imported or manufactured besides the usual ORD-M shipping requirements (ground). And I know for an absolute fact Mastercard has no trouble processing payments for mail order ammo, and the sites I use say they accept , Visa, Discover and Amex. Ditto for knives (e.g. see how many are for sale at Amazon).

For guns you're refusing to do business with Federal Firearms Licensees, the BATF even has a nice page allowing you to verify them: https://www.atfonline.gov/fflezcheck/

I am not aware of any case where the authorities have gone after a payment processor serving a store selling any of these items. It's certainly not common, we watch this because of all the illicit efforts by them to shut down gun stores and manufacturers.

In the long run you might find this policy politically crippling; e.g. it says something that 42 states, with Illinois joining them in a few months, have shall issue concealed carry regimes.