UniFi Network: querying and changing a UniFi site through the official APIs

Ubiquiti ships several APIs that look similar and are not. Getting useful work done depends almost entirely on picking the right one, authenticating it correctly, and knowing which of three overlapping endpoint generations actually answers your question. Almost every hour lost to these APIs is lost to guessing rather than to difficulty, so this skill front-loads the discovery mechanism and the failure signatures.

Never guess an endpoint

Ubiquiti publishes machine-readable indexes. Read them before writing a single request. Probing paths and reading the 404s is slower, produces a false picture of what exists, and reliably misses the one endpoint that solves the problem.