Set up fraud prevention rules

We need fraud rules before Black Friday. Set up rules to block cards that fail AVS or CVC on transactions over $2500, flag multiple card attempts from the same IP more than three times in 10 minutes, and require manual review for new accounts with billing and shipping mismatch. Notify Priya in ops on any blocked payment within five minutes.

Before I push these fraud rules live, make them reviewable for the ops lead: surface the high‑risk thresholds (amounts, retries, mismatch conditions), estimate false positive risk and likely customer impact, and flag actions that would require manual review. Call out any rule that will block enterprise customers (company domain vs billing) so we can whitelist them.

I just wrote rules to block cards that fail AVS/CVC over $2,500 and to throttle IPs after three tries. I’m worried these will reject legitimate purchases from our larger clients who use corporate cards or proxy networks. What is the most likely place this will falsely block a real customer, and what minimal compensating control should I add now (whitelist pattern, grace rule, or preflight alert) to avoid killing revenue while keeping protection?

We keep tightening fraud rules after incidents and each time we accidentally block legitimate customers, which costs sales and trust. What routine should or habit should the product and ops teams adopt so rules evolve safely — a simple prelaunch checklist, rollback windows, and a tagging system for who owns whitelists — that prevents knee‑jerk blocks without slowing responses to real attacks?