I'm writing an integration plugin, how to set some $_SESSION vars after logging in?

Hi

I'm writing an integration plugin with a 3rd party script and I'm having some troubles setting some $_SESSION vars after the user logs in through AMember

the 3rd party script needs to check some $_SESSION in order to function correctly

here's my after_login function

PHP:

function plugin_after_login($user)
    {
    global $db, $config, $plugin_config;
    global $HTTP_COOKIE_VARS, $HTTP_SESSION_VARS;

    $this_config = $plugin_config['protect']['plugin'];

    session_register('_amember_content_plugin_cookies_set');
    $profile = plugin_get_profile($user[login]);
    
    $_SESSION['userid'] = $profile['userid'];
    $_SESSION['fullname'] = $profile['fullname'];
    $_SESSION['email'] = $profile['email'];
    $_SESSION['type'] = $profile['type'];
    }

does anyone have some advice?