Re: Lobby Ambassador Guest Account Provisioning - via SNMP
WCS uses SNMP to create them on the WLC.
The problem with using snmp manually is that they keep on changing the snmp oids on the controllers. If you reverse engineering it with packet captures, after an update of controller you may not find again the snmpset commands to do that from CLI.
That would be the only way I can think of creating users not over GUI.