WooCommerce REST API v4

WooCommerce contains an authenticated merchant/integration API implementation under wc/v4. It is not the shopper-facing Store API and, in the 11.0.0 release build, it is not a generally available core API.

Release gate in 11.0.0

Core registers its v4 controllers only when both conditions pass:

wc_rest_should_load_namespace( 'wc/v4' )
Automattic\WooCommerce\Admin\Features\Features::is_enabled( 'rest-api-v4' )

includes/react-admin/feature-config.php sets rest-api-v4 to false in WooCommerce 11.0.0. On a normal release install, core customers/orders/products/settings/fulfillment/refund-preview v4 routes are therefore absent even though their controller source files ship.

Other extensions can independently register routes under /wc/v4; seeing that namespace in the REST index does not prove WooCommerce core v4 is enabled. Check each exact route.

Do not force the build feature on with woocommerce_admin_get_feature_config in a production extension. The controller namespace is Internal, the surface can change, and consumers need a stable v3 fallback.