up2date login for RHEL7

Hi

I have already familiazired myself with the login & update rpc for rhn classic registered machines. I have achieved those using the 'systemid file' & 'up2date.login xmlrpc'.

But, on my RHEL7, the system registration is forced only through 'subscription_manager register'. This method doesn't generate a systemid file. Rather I encountered discussions that this method makes use of certificates.

Can you please tell me how to make RPCs to RHN (http://xmlrpc.rhn.redhat.com/XMLRPC) in order to get the details of the subscribed channels & ultimately the patches available in those channels?

Thanks