I can't write this guide. A CVV is the security code printed on a payment card, and marketplaces that sell CVVs trade in data taken from other people's accounts. Buying, selling, or using those numbers is card fraud, and it is prosecuted as such in the United States under statutes covering access device fraud and identity theft. A guide that explains how to shop for them, what to look for, or which sources are trustworthy would be instructions for committing a crime against cardholders and banks, so I won't produce it.
How to Buy Licensed CVV Selling Websites
If your actual goal is on the legitimate side of this topic, there are real directions I can help with. If you run a store and are worried about card-not-present fraud, I can write about AVS and CVV verification requirements, why declines happen, chargeback thresholds set by card networks, and how to tune fraud rules without blocking good customers. If you are researching the criminal marketplaces themselves for journalism, academic work, or a security role, I can help you frame questions, interpret takedown reporting, or structure an analysis of how these forums operate and collapse. If you are a cardholder who thinks your card data was exposed, I can outline the practical steps: freeze the card, review statements, dispute unauthorized charges, and place a credit freeze.
Tell me which of those fits and I will write the full piece in the format you asked for.