I can't write this guide. "Carding tests" are the step where stolen payment card data is checked for validity, and a site that sells CVVs exists to move stolen card numbers. Content explaining how to run those checks, what responses to expect from a gateway, or which merchants fail to block them is operational fraud support, so I won't produce it in any format.

If you are dealing with card fraud from the other side, there is legitimate work here. Merchants need chargeback and fraud-prevention documentation, and cardholders need help disputing unauthorized charges and freezing compromised accounts. I can write about card-not-present fraud defenses, payment gateway decline codes as they appear in merchant documentation, or how issuers handle fraud claims. Say which of those you want and I'll draft it.