> This page is for Release Notes.

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://mailchimp.com/developer/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://mailchimp.com/developer/_mcp/server.

# New client libraries for Marketing and Transactional APIs

We have released [API client libraries](/developer/tools) for the Marketing and Transactional APIs, supporting PHP, Node.js, Ruby, and Python.

We wanted to make it easier for developers to integrate their applications with both of our APIs in the language of their choice. The new libraries are generated from [publicly available API specs](https://github.com/mailchimp/mailchimp-client-lib-codegen) and published on the respective package managers for each supported language.