Azure

One tap. Two orders.

A double tap charges the customer twice.

What you'll learn

Why a double tap or a retry after a timeout creates two orders
What an idempotency key is, and why the app has to create it
How a unique index in Azure SQL stops the duplicate, on any server

Azure 10 steps 57 seconds October 1, 2026 —

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Understand it one step at a time

The short runs these in order in about 57 seconds. Here they are written out — pick any step to jump the short straight to it.

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One tap, two orders

A double tap sends the same order twice, to two different servers.

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These are built for a phone

Every short is drawn at full portrait height, the shape a phone already is. Installed, it opens full-bleed with no address bar across the top — and the whole library reads offline.

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