[NBZ4live]

The best way to add new account to vBulletin is to use the vB_Datamanager_User.
Here is the code I use in my Integration.

PHP Code:

function add_new_vb_user($data){
    global $vbulletin;
    
    $userdata =& datamanager_init('User', $vbulletin, ERRTYPE_ARRAY);
    $userdata->set('email', $data['email']);
    $userdata->set('username', $data['username']);
    $userdata->set('password', $data['password']);
    $userdata->set('usergroupid', $data['usergroupid']);
    if(isset($data['membergroupids'])) $userdata->set('membergroupids', $data['membergroupids']);
    $userdata->set('ipaddress', IPADDRESS);
    $userdata->set('showbirthday', 0);
    $userdata->set('timezoneoffset', 1);
    $userdata->set_usertitle('', false, $vbulletin->usergroupcache[$data['usergroupid']], false, false);
    $userdata->pre_save();
    
    if (!empty($userdata->errors))
    {
        return false;
    }else{
        $vbulletin->userinfo['userid']
        = $userid
        = $userdata->save();
        
        return true;
    }
} 


Try include global.php to your script and then use this function to create the accounts.