Install: W System EU VAT Check for WooCommerce on WordPress.org, or search "W System EU VAT Check" under Plugins, Add New.
Free WordPress plugin: validates EU VAT numbers at WooCommerce checkout via VIES (W System API, free 20/day, optional paid key),
applies B2B reverse charge for valid cross-border EU numbers, and stores the VIES consultation number in order meta
(_wsevv_vat_number, _wsevv_status, _wsevv_consultation_number, _wsevv_company_name, _wsevv_checked_at, _wsevv_reverse_charge).
See readme.txt for the wordpress.org description. GPLv2 or later.
Build the wordpress.org ZIP: ./build-zip.sh → dist/w-system-eu-vat-check.zip.
Coding standards: phpcs --standard=WordPress . (clean).
Guide and install steps: https://wsystem.dev/woocommerce-eu-vat-number-validation Download: https://github.com/wsystemdev/woo-eu-vat-validator/releases/latest/download/w-system-eu-vat-check.zip