Pidgin 2.5.4 can not automatically authenticate to an AuthServ bot, even using the IrcHelper plugin (see Plugin-Pack, or Pulrple-Pack).

To work around this, I foudn a trick:
- add authserv to your contact list
- set up a Buddy Pounce against authserv, with options (those, ane ONLY those; disable everything else than the following):
-- when = signs on
-- action = execute command
-- option = recurring

The command to execute for me is: purple-remote 'irc:goim?account=doublehp@irc.onlinegamesnet.net&screenname=AuthServ@Services.OGameNet.net&message=AUTH doublehp MyPassword'

This line is server specific. If you have only one IRC account in pidgin, you can ommit the account= option. Pidgin will default to the default/only/first account.

AuthServ@Services.OGameNet.net is also a server specific thing. On other networks, you are likely to want screenname=AuthServ .

I am working on adding autojoins to this. When asking Pidgin to autojoin rooms, it fails, because it tries to do this before it can detect Authserv and auth to it. It should be possible to extend the command line with a feature for autojoining.