authorization policy based on cert issuer (was: Why Authorization before Authentication)

Seems that I'm slowly getting it.

To authorize subscriber you should make a decision based on both subscriber profile and authentication result. This is what post-auth section does. Put your authorization policies in this section. So do I understand this correctly: if I, for example, want to put a client into a VLAN according to the EAP-TLS certificate issuer, the recommended way to to that is to use unlang to check %Client-Cert-Issuer in the post-auth section and use the "update reply" command to set the Tunnel-Private-Group-Id reply attribute?