pam_radius_auth query

Hi,Please clarify my doubts. 1. does pam_radius_auth.so support authorization of user accounts? 2. If Yes how can we achieve it? what configurations need to be done. Now pam_radius_auth.c sends authentication requests with the value PW_AUTHENTICATE_ONLY. what value i need to send? and what configuration I have to make at server side to implement authorization. I am using pam_radius_auth.so for authentication and it is working fine. At the free radius server side  I am authenticating users using /etc/password  file as database.(I have enabled "unix" option in "default" file authorization section.) Thanks and Regards, VIJAY S.