> For the complete documentation index, see [llms.txt](https://docs.encedo.com/hem-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.encedo.com/hem-api/reference/api-reference/authorization/external-authenticator.md).

# External authenticator

## Registration

The external authenticators need to be registered with the HEM, here is a description of how.

{% content-ref url="/pages/LJAuL0kNmpGa2mipiRhT" %}
[Registration](/hem-api/reference/api-reference/authorization/external-authenticator/registration.md)
{% endcontent-ref %}

## Usage

Step by step description of how to use an external authenticator.

{% content-ref url="/pages/wlxthlj5o3JIqoAqJoj9" %}
[Authentication](/hem-api/reference/api-reference/authorization/external-authenticator/authentication.md)
{% endcontent-ref %}