Get started building extensions

This section provides guides and resources for building, testing, and distributing WooCommerce extensions.
Important: Internal vs public code
Not all WooCommerce code is intended for use by extensions. Classes in the 
Automattic\WooCommerce\Internal namespace and code marked with 
@internal are for WooCommerce core use only: backwards compatibility between WooCommerce releases is not guaranteed and your extension may break if you use them. See the extension development best practices and the Internal namespace documentation.
Getting started
Design a simple extension - Learn extension architecture and best practices
Build your first extension - Create your first WooCommerce extension
Core concepts - Master fundamental concepts like plugin headers, lifecycle management, and security
Submit to the WooCommerce Marketplace
Join the WooCommerce Marketplace and get your extension in front of 3.6M+ active stores worldwide.
Learn more about why extension developers are choosing the WooCommerce Marketplace and submit your extension
Quality Insights Toolkit (QIT)
Available to all developers with a WooCommerce.com vendor profile
QIT (Quality Insights Toolkit) is a testing platform developed by WooCommerce for plugins and themes. It allows developers to quickly run a variety of managed tests out-of-the-box, as well as integrate their own custom E2E tests to ensure their extensions are reliable, secure, and compatible.
Key features
Managed test suites: Run pre-configured end-to-end tests, activation tests, security scans, PHPStan analysis, API tests, and more
Custom E2E testing: Write and run your own Playwright-based E2E tests directly through QIT
Continuous quality checks: Seamlessly integrate QIT into your development workflows via CLI, GitHub Actions, and more
Marketplace integration: Currently in closed beta for extensions listed on the WooCommerce Marketplace
Learn more about QIT
Development tools
Extension scaffolds - Learn how to scaffold new extensions with our create-woo-extension package.
WooCommerce CLI - Command-line tools for WooCommerce development