public function printInvoice($order_id, $res = 'invoice-sent', $hstyle = 'basicVER3')
 {
     $this->load->model('sale/order');
     $this->load->model('catalog/product');
     if ($order_id) {
         $api = new InvfoxAPI($this->CONF['API_KEY'], $this->CONF['API_DOMAIN'], true);
         $api->printInvoice($order_id, $res, $hstyle);
     } else {
         echo "Error : There is no invoice generated";
     }
     //$order = $this->model_sale_order->getOrder($order_id);
 }
 public function printInvoice($order_id, $res = 'invoice-sent', $hstyle = 'basicVER3')
 {
     if ($order_id) {
         $api = new InvfoxAPI($this->CONF['API_KEY'], $this->CONF['API_DOMAIN'], true);
         $api->printInvoice($order_id, $res, $hstyle);
     } else {
         echo "Error : There is no invoice generated";
     }
 }