FOX - Currency Switcher Professional for WooCommerce

The plugin URL: https://progostech.com/

•  in file \wp-content\plugins\woocommerce-currency-switcher\classes\fixed\fixed_price.php add  code (see screen #1 below):

  OR $_product->is_type('box_product')

   

• on  file  \wp-content\plugins\ultimate-box-product\includes\class-ubp-frontend-cart.php  add  code:

  if (class_exists('WOOCS')) {
      global $WOOCS;
      if ($WOOCS->is_multiple_allowed) {
          $currencies = $WOOCS->get_currencies();
          $conversion_rate = $currencies[$WOOCS->current_currency]['rate'];
          $ubp_box_product_price = $ubp_box_product_price / $conversion_rate;
      }
  }