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Ah, okay, makes sense (in an evil way).

It just sounded like it was a sudden wave after the site had become more popular, but it maybe just appeared on the radar of scammers as well as the competition.

I have long stopped telling people whether their charge worked if an order looks suspicious, to prevent them from getting this information. So that wouldn't work now.

I am not sure I follow, could you clarify? You do send a confirmation after sign up I presume?

Can't find it but he had a whole blog post about it

Well I can't say "your payment was processed successfully", because that would give information to people who want to test cards. Rather I manually read through the orders, and only contact people if something went wrong with their payment AND the order doesn't look suspicious.

Are you on Stripe?

So I guess credit card frauds are human too