# Fullscript API — agent guide

> Use machine-readable sources below. Do not scrape HTML doc pages when these URLs are available.

## Start here

- [llms.txt](http://fullscript.dev/llms.txt) — curated documentation index
- [integration-environments.json](http://fullscript.dev/integration-environments.json) — canonical API and OAuth URLs
- [OpenAPI spec](https://us.fullscript.com/docs/api/open-api/v1/openapi.json) — REST schemas and examples
- [For AI](http://fullscript.dev/docs/getting-started/for-ai/overview) — reading order, pitfalls, copy-paste context

## Rules

- OAuth authorize and token calls must use the hosts in integration-environments.json
- Partner API only — never call /api/dashboard/* (internal dashboard BFF)
- Verify webhooks with the Fullscript-Signature HMAC header