code: func (r Network_Storage_Backup_Evault) GetUsageNotification() (resp datatypes.Notification, err error) {
  	err = r.Session.DoRequest("SoftLayer_Network_Storage_Backup_Evault", "getUsageNotification", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The usage notification for SL Storage services.