/** * Get the class instance */ public static function get_instance() { return null === self::$instance ? self::$instance = new self() : self::$instance; }
/** * Include required files * * @since 1.4.0 */ private function includes() { require 'includes/class-wc-shipment-tracking.php'; $this->actions = WC_Shipment_Tracking_Actions::get_instance(); }