The ability to sync resident demographics from OneSite to ActiveBuilding in real time for unregistered residents is already in place under My Dashboard > Resident Management > Sync Resident. More information about sync can be found by hovering over the '?' icon next to the Sync Resident button.
Once the information is synced, a new invite will need to be sent if the email changed. To do this select Re-send Invite > Invite.
Currently, only emails can be pushed from ActiveBuilding to OneSite in real time. Registered residents can update their email under Account Settings.
To save the email, the resident will be need to confirm their password.