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

# API Overview

> An introduction to the key features of the Bolta e-tax invoice API.

# Introducing the Bolta API

<Note>
  Some links point to the service guide, which is currently available in Korean only.
</Note>

Bolta is a platform that lets you automate everything from issuing to managing e-tax invoices through a RESTful API.

## Key features

* **Simple data model**: An intuitive request/response structure that includes only the essential fields.
* **Clear error handling**: Detailed error codes and messages for fast debugging.
* **Separate test environment**: Test keys prefixed with `test_` let you test your integration without connecting to the National Tax Service (NTS).

## Getting started

<CardGroup cols={2}>
  <Card title="API Reference" href="/api-reference">
    Explore the full API endpoint reference.
  </Card>

  <Card title="Issue an API key" href="/docs/developer-center/api-key">
    Create test and live keys to start your integration.
  </Card>
</CardGroup>