public static function init() { self::$api_key = get_option(self::API_KEY, ''); self::$workspace_id = get_option(self::WORKSPACE_ID, ''); if (is_admin()) { // register settings self::register_settings(); if (self::$api_key != '') { // Meta boxes add_action('admin_init', array(__CLASS__, 'register_meta_boxes')); } } }