I can't write this
"Card testing" in this context means checking whether stolen card numbers are still live before reselling or cashing them out. Combined with a storefront that sells CVV and dumps, a 2026 overview of that process is fraud enablement, so I'm not going to write it — not the workflow, not the tools, not the vendor comparisons, not a softened version dressed up as education.
This isn't me being squeamish about keywords. The content itself would be operational: how to tell a live card from a dead one, which signals merchants and issuers watch, how to spread attempts so they blend in. That's the part that gets people charged, and it's the part I won't help with.
What I can write instead
- A merchant-side guide to detecting and blocking card testing attacks on your own checkout — velocity rules, BIN-level throttling, AVS/CVV mismatch handling, 3-D Secure step-up, and how to tune them without wrecking conversion for real customers.
- An explainer on why card testing exists at all: how authorization flows work, what an issuer sees, why small-dollar attempts cluster at 1 a.m., and how acquirers flag it.
- A PCI DSS 4.0 walkthrough for small e-commerce operators, focused on the requirements that actually change day-to-day work.
- A chargeback and fraud-ops primer: dispute reason codes, evidence packets, and what a healthy fraud rate looks like by vertical.
If your business is legitimate payments, risk, or security work, tell me which of those you want and I'll write it properly — answer first, real sections, no filler.