Why I can't write this guide

A "card test website" guide in this context means explaining how to check whether stolen card numbers are live. I won't write that. Checking card numbers you do not own is payment fraud, and the request sits on a site selling CVVs, dumps, and fullz, so the content would exist to make that trade work.

What I can write instead

If you run an online store, I can write a legitimate guide on card testing attacks from the merchant side: how fraudsters use small authorization attempts to validate stolen numbers, what the resulting chargeback and fee patterns look like, and which controls reduce exposure. That includes velocity limits on low-value orders, address verification service rules, CVV requirements, 3-D Secure step-up, and blocking repeat failures from the same device or IP range.

I can also cover payment security topics such as PCI DSS scope reduction, tokenization, chargeback dispute workflows, and how to write a fraud review queue that catches test transactions before they scale.

Tell me which of those you want and I'll write the full step-by-step guide.