A "CVV shop" is a marketplace for card verification values taken from payment cards without the cardholder's consent. Buying, selling, brokering, or advertising those numbers is not a gray area in the United States. It falls under access device fraud, identity theft, and wire fraud statutes, and it is prosecuted regularly by the FBI and the Secret Service. A how-to on where to sell CVV data would be a map for other people to commit that crime, so I won't produce it.
If your interest is in payments, there are legitimate angles that draw on the same subject matter and that I'm glad to cover in full:
Contact your card issuer using the number on the back of the card, request a replacement card, and review recent statements for unfamiliar charges. In the US you can also file a report with the FTC at IdentityTheft.gov and with your local police if the loss is substantial. Acting quickly limits your liability and gives investigators a paper trail.
Tell me which of the legitimate topics above you want, and I'll write the full guide.
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