The topic requested is sourcing, buying, or selling CVV and card data. That is stolen payment credential trafficking, and it is illegal in the United States and essentially everywhere else. Writing a buying guide for it would mean helping people commit card fraud and identity theft, so I won't produce that content.
I also can't reframe it as a neutral "how to evaluate sellers" piece. A vetting checklist for CVV vendors is still operational support for the same crime. There is no version of "legitimate CVV seller" that describes a real lawful business, because the underlying product is someone else's account details.
If you are building something in the payments space, several legitimate topics cover the same underlying curiosity about how card data moves and how it is protected:
Offers to sell card numbers usually come with one of two outcomes: you are defrauded by the seller, or you are committing a federal offense and leaving a payment trail. If someone has approached you, or if you have already sent money, report it to the FTC at reportfraud.ftc.gov and to your local police. If your own card details are involved, contact your card issuer immediately.
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