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That happened to a non-profit I help as well.

We were attacked by someone using different IP addresses testing out credit cards. Stripe caught a lot of these but surprisingly it seemed several went through that we had to refund & pay the transaction fee for. A lot of these didn't even require the CVC check it seemed.

We were able to get fairly good support, 100 times better than most places I deal with.

Unfortunately we had to switch to Radar for Teams to put in fairly basic checks such as making sure CVC verification happens before accepting the card. This costs a bit extra per transaction.

At the end of the day we were able to get it solved. Stripe puts plenty of human resources on helping & they have fairly good documentation. It does really stink that we need to purchase Radar for Teams just to add a few basic rules in place to prevent scammers like this. We lost around $100 that could have went to helping families whose kids have cancer which always sucks. We also had to implement an "invisible" Google Captcha which I wasn't a fan of. This could have been a lot worse though which is what troubled me the most.



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