rlm_exec for diferent users

[Miguel]

Hi, how can i run diferent scripts depending on the usergroup of the 
username?
According to the documentation:
in radiusd.conf i can define diferent rlm_exec scripts:

modules {
    exec tariff {
        program = "/path/to/program/tariff"
        wait = yes
        input_pairs = request
        output_pairs = reply
    }
    [...]
    exec billing {
        program = "/path/to/program/billing"
        wait = yes
        input_pairs = request
        output_pairs = reply
    }
    [...]
}

authorize {
    [...]
    exec
    [...]
}

So, _every_ user will execute both scripts, i want that user a from 
usergroup tariff execute the script tariff, user b from usergroup 
billing execute script billing, etc
Right now im doing it with radgroupreply and exec-program-wait, but this 
is depreciated, isnt it?
what options did you leave me?, to check this  inside every script?
thanks