woocommerce_get_registered_extended_tasks filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_get_registered_extended_tasks', 'filter_function_name_423' );
function filter_function_name_423( $array ){
	// filter...

	return $array;
}

$array

-

Where the hook is called

$registered_extended_tasks_list_items = apply_filters( 'woocommerce_get_registered_extended_tasks', array() );

Where in WP core the hook is used WooCommerce