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action is not described

woocommerce_blocks_(registry_identifier)_registration action-hook . WC 1.0

Hook: integration_registration.

Runs before integrations are initialized allowing new integration to be registered for use. This should be used as the primary hook for integrations to include their scripts, styles, and other code extending the blocks.

Usage

add_action( 'woocommerce_blocks_(registry_identifier)_registration', 'action_function_name_2707' );
function action_function_name_2707( $that ){
	// action...
}
$that(IntegrationRegistry)
Instance of the IntegrationRegistry class which exposes the IntegrationRegistry::register() method.

Where the hook is called

IntegrationRegistry::initialize()
woocommerce_blocks_(registry_identifier)_registration
woocommerce/packages/woocommerce-blocks/src/Integrations/IntegrationRegistry.php 48
do_action( 'woocommerce_blocks_' . $this->registry_identifier . '_registration', $this );

Where in WP core the hook is used WooCommerce

woocommerce/packages/woocommerce-blocks/src/Payments/Api.php 53
add_action( 'woocommerce_blocks_payment_method_type_registration', array( $this, 'register_payment_method_integrations' ) );