Short answer
There is no lawful way to start selling CVV data. A CVV is an access device tied to a payment card account. Selling it without the account holder's authorization is a federal crime in the United States. I will not write a how-to for it.
What the law says
18 U.S.C. § 1029 covers fraud and related activity connected to access devices. The statute reaches producing, selling, transferring, and possessing card numbers and CVVs with intent to defraud. It also covers equipment used to read or encode card data.
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18 U.S.C. § 1028 covers identity documents and means of identification. Card data often falls under both statutes.
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Penalties
A first offense under § 1029 carries up to 10 years in prison and fines. Aggravated conduct, including certain prior convictions or losses above set thresholds, raises the maximum to 15 or 20 years. Federal sentencing guidelines add time based on loss amount and number of victims.
Detection
Card networks score transactions in real time. Issuers flag unusual merchant categories, velocity, and geography. Marketplaces that trade stolen card data are subject to takedown and criminal referral. Buyers and sellers face the same exposure, and undercover purchases are routine.
If you have been a victim
Report card fraud to the card issuer first. Then file a report with the FTC at IdentityTheft.gov and, for internet-linked fraud, with the FBI Internet Crime Complaint Center.