# Overview

You can use large language models (LLMs) to assist in the building of SumUp integrations. We provide a set of tools and best practices if you use LLMs during development.

## Plain Text Docs

You can access all of our documentation as plain text Markdown files by adding `index.md` to the end of any URL. For example, you can find the plaintext version of this page itself at https://developer.sumup.com/tools/llms/index.md.

This helps AI tools and agents consume our content and allows you to copy and paste the entire contents of a doc into an LLM. This format is preferable to scraping or copying from our HTML and JavaScript-rendered pages because:

- Plain text contains fewer formatting tokens.
- Content that isn’t rendered in the default view (for example, it’s hidden in a tab) of a given page is rendered in the plaintext version.
- LLMs can parse and understand Markdown hierarchy.

We also host an [/llms.txt](/llms.txt) file which instructs AI tools and agents how to retrieve the plaintext versions of our pages. The `/llms.txt` file is an [emerging standard](https://llmstxt.org/) for making websites and content more accessible to LLMs.

## Agent Skills

If you use AI coding assistants, SumUp also provides [Agent Skills](/tools/llms/agent-skills/) to give your assistant targeted guidance for building payment integrations. You can install the `sumup/sumup-skills` repository in tools like Claude Code, Cursor, Gemini CLI, and OpenAI Codex, then invoke the `sumup` skill for checkout implementation and troubleshooting tasks.

## SumUp Model Context Protocol (MCP) Server

Use the [SumUp MCP server](/tools/llms/mcp-server/) to connect MCP-compatible clients and AI assistants to SumUp APIs and documentation tools.

Hosted MCP URL: [https://mcp.sumup.com/mcp](https://mcp.sumup.com/mcp)

You can also run MCP locally:

```sh
SUMUP_API_KEY='sup_sk_...' npx -y @sumup/mcp
```

For full setup instructions and client examples, see [MCP Server](/tools/llms/mcp-server/).

## SumUp Agent Toolkit SDK

If you’re building agentic software, we provide an SDK for adding SumUp functionality to your agent’s capabilities. Learn more in our [agents documentation](/tools/llms/agent-toolkit/).