WooCommerce Currency Switcher

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Plugin: https://woocommerce.com/products/woocommerce-subscriptions/

• In file functions.php of your current wp theme add next code:

  add_filter('woocommerce_subscription_price_string_details', 'woocs_woocommerce_subscription_price_string_details', 100, 2);
  
  function woocs_woocommerce_subscription_price_string_details($arg, $_this) {
      if (class_exists('WOOCS')) {
          global $WOOCS;
          $order_currency = get_post_meta($_this->get_id(), '_order_currency', true);
          if ($order_currency AND $WOOCS->current_currency != $order_currency) {
              $WOOCS->set_currency($order_currency);
          }
      }
      return $arg;
  }

• In file \wp-content\plugins\woocommerce-subscriptions\includes\wcs-order-functions.php add next code:

  if (class_exists('WOOCS')) {
      global $WOOCS;
      $order_currency = get_post_meta($order_id, '_order_currency', true);
      if ($order_currency AND $WOOCS->current_currency != $order_currency) {
          $WOOCS->set_currency($order_currency);
      }
  }