remote api - mail_user_add help

I'm trying to use the remote api for adding an email user to a domain. I have it creating the user but a few db fields in dbispconfig.mail_user don't seem to update correctly. The main one is sysgroup_id. When I create using ispc, the sysgroup_id updates to 0 which works fine. When I use remote api, it updates to 1 by default.
Can someone point me to the correct parameter to set that?

 

this didn't seem to help. it's still populating the db with sys_groupid = 1.

 

ispc: 3.0.5.4p8

Here are the params being passed.

Code:

$params = array(
                    "email" => $data["email"],
                    "login" => $data["email"],
                    "password" => $data["password"],
                    "name" => $data["name"],
                    "quota" => "0",
                    "disablepop3" => "y",
                    "server_id" => "2",
                    "uid" => "5000",
                    "gid" => "5000",
                    "client_id" => "0",
                    "maildir" => "/var/vmail/domain.com/" . $data["user"],
                    "homedir" => "/var/vmail",
                    "move_junk" => "Y",
                    "postfix" => "y"                   //Enable Receiving
                );


                $affected_rows = $client->mail_user_add($session_id, $client_id, $params);

I decided to try and pass sys_groupid => "0" just to test , but it still stored as 1.

 

Sorry Till, maybe I'm just not understanding it. I removed
"client_id" => "0",
from the params array and passed it as $client_id = 0; for the function, but it's still saving as sys_groupid = 1 in mail_user table.