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REST API BEST PRACTISES #6
Your Users Deserve Better: Making Peace with Idempotent APIs in 2025
Why Idempotency is the Most Romantic Concept in Backend Engineering?
We built a beautiful payment API. Tested it with QEs. Deployed it with DevOps. Life was so good. 😌 Then we launched it in production… A few weeks went by as well, luckily.
A Lovely Monday Morning
boom 💣
Support tickets came flooding into our side:
Priority — High
Ticket No : 342342343
Title: Payment API Issue
Description — “Hey… I got charged twice!”
What? & How?
Some users had slow Internet access. Their app thought the request failed — and retried it.
Our server? It thought — “I See! A new payment. Let’s charge again!”
So we charged twice for the same thing.
And yeah… it hurt. Bad, really Bad.
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