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> Try2Check, one of the cybercrime underground’s most trusted services for checking the validity of stolen credit card data

I know nothing about carding, but how does it actually work? How is that website able to verify a card's validity, and why can't competitors easily build a similar service?

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They had access merchant accounts to do pre-authorizations. Which is risky, because it's easy to trace back and shut down, so you would need lots of them. I imagine they had found a large-scale way of gaining merchant account credentials, or somehow triggering ONLY a pre-auth, that nobody else had figured out.

Maybe abusing services that have "free trial, requires credit card" ? I bet a lot of those do pre-auths.

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