The following command adds a client side SSO domain with the name clientdomainname:

curl -k "https://bal:1fourall@20.200.25.100/access/adddomain?domain=clientdomainname"

Response: 

<?xml version="1.0" encoding="ISO-8859-1"?>
<Response stat="200" code="ok">
<Success>Domain 'CLIENTDOMAINNAME' created</Success>
</Response>