> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dfns.co/llms.txt
> Use this file to discover all available pages before exploring further.

# API Reference

> This section is where you can find our complete API reference, including request operations and responses.

<img class="dfnsHero" src="https://mintcdn.com/dfns-6d8c7466/C-QxugfNcolBADI3/images/APIReferenceHero.png?fit=max&auto=format&n=C-QxugfNcolBADI3&q=85&s=e71cbee2f803044e24da6a2bc6fe1013" alt="API Reference" noZoom width="2368" height="640" data-path="images/APIReferenceHero.png" />

## Core objects

Make sure you go through our [core objects documentation](/api-reference/core-objects) to understand the key entities you'll be working with.

## Authentication

This is a key aspect of working with the Dfns API. You'll need to include a token in the headers of your requests to authenticate to all APIs, but also to sign change-inducing requests. See the [API Authorization](/api-reference/auth) documentation for more details.

We use passkeys to replace passwords, you can read all about it in our [credentials documentation](/api-reference/auth/credentials).

## API format & HTTP headers

To ensure correct processing of API calls, please follow these conventions

| Header         | Value                 |
| -------------- | --------------------- |
| *Content-type* | `application/json`    |
| *User-agent*   | `<must not be empty>` |