# How to Stop Charging Customers Twice: A Practical Idempotency Guide

DevFeed: [How to Stop Charging Customers Twice: A Practical Idempotency Guide](<https://devfeed.tech/articles/how-to-stop-charging-customers-twice-a-practical-idempotency-guide-18113.md>)

Original publisher: [Read original article](<https://thetshaped.dev/p/how-to-stop-charging-customers-twice-practical-idempotency-guide-http-message-queues>)

Author: The T-Shaped Dev

Published: 2026-06-09T03:20:24Z

Content type: tutorial

Language: en

Sources: [The T-Shaped Dev](<https://devfeed.tech/sources/the-t-shaped-dev.md>)

Topics: [HTTP](<https://devfeed.tech/topics/http.md>), [systems](<https://devfeed.tech/topics/systems.md>)

Tags: [guide](<https://devfeed.tech/tags/guide.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [http](<https://devfeed.tech/tags/http.md>)

## AI overview

A practical guide to idempotency explains how to prevent duplicate charges when payment requests are retried. It covers HTTP requests, message queues, and the distinction between idempotent and non-idempotent operations.

## Source excerpt

Idempotency in plain English: HTTP, message queues, and the one detail that decides whether it's real.