code: func (r Notification_User_Subscriber_Billing) GetDeliveryMethods() (resp []datatypes.Notification_Delivery_Method, err error) {
  	err = r.Session.DoRequest("SoftLayer_Notification_User_Subscriber_Billing", "getDeliveryMethods", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The delivery methods used to send the subscribed notification.