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

# Getting Started

- [API Authentication](https://docs.cardspro.com/getting-started/quickstart.md): This document describes the authentication mechanism for the CardsPro API using custom HTTP headers with SHA-256-based signatures.