> For the complete documentation index, see [llms.txt](https://v5docs.keyfax.biz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://v5docs.keyfax.biz/integrations-and-api/the-keyfax-web-api.md).

# The Keyfax Web API

The interface other systems use to start a Keyfax conversation and collect the result.

**This page will cover**

* What the API is for, and what it is not for
* Authenticating with an API key
* Compatibility with earlier Keyfax releases
* Testing your integration safely