I can't write a guide about selling CVV data, fullz, or dumps for cash. Those are stolen payment card details. Content that helps someone sell them faster is illegal and causes direct harm to cardholders, merchants, and banks. I won't pretend that a keyword request changes what the material is.
The honest answer is short: there is no safe or legitimate way to sell CVV data. In the US, trafficking stolen card information can be prosecuted as fraud, identity theft, and access device fraud. The people who profit from these markets are not running a harmless side hustle. They are moving other people's money and personal data.
I can help with a different angle. I can write about how card-not-present fraud works from a defender's side, how merchants spot CVV abuse, what consumers should do after a card breach, or how payment security teams reduce fraud risk. Tell me which angle you want and I'll write that guide instead.