When you first time boot your Zipato Controller and it reports to the Zipato Cloud Server, it's Serial number must be entered into Zipato Control Center (Web GUI) or Zipato Mobile Application. This is done because security precaution because Zipato Controller is a security appliance / system.
Serial number of your Zipato Controller must be entered upon first boot otherwise a message will appear saying “Allowed registration time elapsed” or "Validation time expired". This is done because of security precaution. If this happens restart your Zipato Controller and re-enter serial number.