Sales
Practice
PRO
Anti-Fraud: Chargebacks and Multi-Accounts
Money leaks from any selling service three ways: a payment bug gives a double grant, one access is handed out to a crowd, and trials and promos get abused from multi-accounts. All three holes are closed procedurally. I show how — with concrete fields and rules.
This material is about engineering your own infrastructure and is educational in nature. Handle the money aboveboard. This is about protecting your service from abuse, not about circumventing others' systems.
Hole 1. Double grants (idempotency)
The most frustrating leak: the customer paid once but got two terms. Why it happens — providers do webhook retries (that's normal), plus the customer can hit "pay" twice. Without protection, every repeat = an extra free term.
How I close it:
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