> For the complete documentation index, see [llms.txt](https://docs.facephi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.facephi.com/docs.facephi-pt-br/sdks/backend-sdk/ine/technical_documentation/api_reference/authentication.md).

# Authentication

Operación protegida de autenticación facial.