> For the complete documentation index, see [llms.txt](https://developers.docstudio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.docstudio.com/introduction.md).

# Introduction

- [API Overview](https://developers.docstudio.com/introduction/api-overview.md): This document contains an overview of DocStudio API capabilities and common integration workflows.
- [Core concepts](https://developers.docstudio.com/introduction/core-concepts.md): This document contains the main DocStudio API concepts and their relationships.
- [Authentication and Application tokens](https://developers.docstudio.com/introduction/authentication-and-application-tokens.md): This document explains how to authenticate DocStudio API requests with application and temporary authorization tokens.
- [API token security](https://developers.docstudio.com/introduction/api-token-security.md): This document explains how to store, use, and replace DocStudio API tokens securely.
- [Send your first envelope](https://developers.docstudio.com/introduction/send-your-first-envelope.md): This document explains how to send, track, and download your first envelope with DocStudio API.