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
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