Several gun-related businesses were suddenly — and without warning — disrupted in recent weeks when Intuit stopped processing credit card payments because sales were gun-related, The Post has learned.

Some of the payments stopped didn’t even involve firearms, but simply T-shirts and coffee mugs and gun safety classes, according to small business owners.

As a result, the businesses had to scramble to track down customers to get them pay their bills after Intuit credited back to customers’ accounts the purchases — even if the T-shirt was already shipped or the class already taken, one businessman told The Post.

At Gunsite Academy, a Paulden, Ariz., company that provides marksmanship training in addition to selling guns that ship to a licensed gun shop near the customer’s home, Ken Campbell was dinged by Intuit’s action.

Campbell, a former Indiana sheriff, had just switched credit card processors this spring — to Intuit, the parent of TurboTax and Quicken software — when the trouble began, he said.

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