I solved this so anyone else that needs help ...
// Initialize IPS4 Framework
require_once( '../init.php' );
// Indicate that we should consider this a front-end session so we can obtain the currently logged in users information.
\IPS\Session\Front::i();
// Fetch member details
$setting = \IPS\Member::loggedIn()->profileFields();
// display name
if($setting['core_pfieldgroups_4']['core_pfield_15'] != '')
{
$nick = $setting['core_pfieldgroups_4']['core_pfield_15'];
}
else
{
$nick = "Chatter-%25";
}
// chat password
$nickpass = $setting['core_pfieldgroups_4']['core_pfield_16'];