E-commerce

Articles about e-commerce — 2 posts.

24 October 20265 min read

Currency Conversion Rounding: How to Convert Money Without Floating-Point Errors

Floats quietly corrupt money. Here is how to do currency conversion rounding properly: keep exact decimals, round once at the end, and respect each currency's minor units.

24 October 20266 min read

How to Cache Exchange Rates Without Showing Stale Prices

Calling a rates API on every page view wastes quota and slows pages. Here is how to cache exchange rates with the right TTL for each use case, and how to fall back safely when the API is unavailable.