/**
  * Convenience methods for other plugins to easily get add-ons for a given
  * order
  *
  * @since 1.0
  * @param int $order_id WC_Order ID
  * @return array of WC_Checkout_Add_On objects
  */
 public function get_order_add_ons($order_id)
 {
     $order = SV_WC_Plugin_Compatibility::wc_get_order($order_id);
     $add_ons = get_option('wc_checkout_add_ons', array());
     $order_add_ons = array();
     foreach ($order->get_items('fee') as $fee_id => $fee) {
         // bail for fees that aren't add-ons or deleted add-ons
         if (empty($fee['wc_checkout_add_on_id']) || !isset($add_ons[$fee['wc_checkout_add_on_id']])) {
             continue;
         }
         $add_on = new WC_Checkout_Add_On($fee['wc_checkout_add_on_id'], $add_ons[$fee['wc_checkout_add_on_id']]);
         $order_add_ons[$fee['wc_checkout_add_on_id']] = array('name' => $add_on->name, 'checkout_label' => $add_on->label, 'value' => $fee['wc_checkout_add_on_value'], 'normalized_value' => maybe_unserialize($fee['wc_checkout_add_on_label']), 'total' => $fee['line_total'], 'total_tax' => $fee['line_tax'], 'fee_id' => $fee_id);
     }
     return $order_add_ons;
 }