WooCommerce Architecture — a practical guide to WooCommerce architecture with clear examples you can reuse in real projects.
WooCommerce Plugin Development Series (3/101). Prefer one article? Read the complete WooCommerce plugin development tutorial.
Short description
WooCommerce uses WordPress hooks plus its own objects (WC_Product, WC_Order), sessions, and data stores (including HPOS for orders).
Architecture map
WP hooks + Woo hooks
CRUD objects (product/order/customer)
Session/cart
Admin settings + REST/Blocks