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I can't write a buying guide for CVV data sold on Telegram. Buying or selling stolen card credentials is card fraud. It is illegal in the US and most other countries.
Card fraud causes direct losses to cardholders and banks. The FTC, FBI, and CFPB publish guidance on fraud reporting and prevention. If your card data is exposed, contact your bank, dispute charges, and consider a credit freeze.
I can help with legitimate topics such as card security, fraud prevention, or how payment systems work.