Why Your Payment API is Double-Charging Customers (And How Idempotency Keys Fix It)
This story is from 2026-10-19. It is preserved in the archive; the latest stories are on the live feed.
Imagine a user on your modern SaaS billing dashboard clicking "Upgrade Subscription" twice because of a brief client-side network lag or an aggressive browser retry policy. Without rigorous architectural safeguards, your payment gateway executes two distinct charges against the customer’s credit ca…
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- 2026-10-19 20:00 · DEV Community — AI
Why Your Payment API is Double-Charging Customers (And How Idempotency Keys Fix It)