/**
  * @param string $post_type
  * @param WP_Post $post
  */
 static function add_booking_meta_box($post_type, $post)
 {
     if ($post_type != 'shop_order') {
         return;
     }
     // Do not show if the order does not use fraktguiden shipping.
     $order = new Bring_WC_Order_Adapter(new WC_Order($post->ID));
     if (!$order->has_bring_shipping_methods()) {
         return;
     }
     add_meta_box('woocommerce-order-bring-booking', __('Bring Booking', 'bring-fraktguiden'), array(__CLASS__, 'render_booking_meta_box'), 'shop_order', 'normal', 'high');
 }