/**
  * get payment type
  */
 function getPaymentTypeForOrder($order_id)
 {
     require_once 'models/ecommerce/ecommerce_order.php';
     $Order = new ecommerce_order();
     $Order->setCacheable(false);
     $order_data = $Order->detail($order_id);
     return $order_data['payment_type'];
 }