On the surface, the tech behind a payments API may look like any other startup’s. You'll probably find some Rails apps, a database, and a bunch of stuff off to the sides to glue it together. GoCardless found it's mostly not the tech that differs, but the approach.
Using their high-availability Postgres cluster as a running example, they explore how reliability became so important to them, and dive into the most recent feature they built into the cluster: zero-downtime patch upgrades.
