Kicking off billing scipt in accounting block

Hi, I tried to execute a billing script as follows: accounting{ sql exec /etc/billing/bill } But, I am getting: /usr/local/etc/raddb/sites-enabled/default[350]: Expecting section start brace '{' after "exec /home/billing/bill" Errors reading /usr/local/etc/raddb/radiusd.conf What is wrong with my syntax? Is there any sample that I can refer to? I checked the unlan, but I could not find anything that mentions the variable that I can use to pass to the script. What I like to do is to call the script: exec /etc/billing/bill <radacctid> That way, I can know which line to process. Thanks for any suggestion. Regards, Pete