/**
  * Fired after an order is saved. It checks that the order currency has been
  * stored against the post, adding it if it's missing. This method is needed
  * because, for some reason, WooCommerce does not store the order currency when
  * an order is created from the backend.
  *
  * @param int post_id The post (order) ID.
  * @param WC_Order The order that has just been saved.
  */
 public function woocommerce_process_shop_order_meta($post_id, $post)
 {
     $order = new Aelia_Order($post_id);
     // Check if order currency is saved. If not, set it to currently selected currency
     $order_currency = $order->get_order_currency();
     if (empty($order_currency)) {
         $order->set_order_currency($this->get_selected_currency());
     }
 }