function verify_wpf_auto_login( $end, $contact_data ) {

    if ( isset( $_GET['cid'] ) ) {

        // If there's no &d= parameter in the URL, or the date doesn't match today's date
        // end the auto login session

        if ( ! isset( $_GET['d'] ) ) {
            return true;
        }

        if ( urldecode( $_GET['d'] ) != date('Ymd') ) {
            return true;
        }
    }

    return $end;

}

add_filter( 'wpf_end_auto_login', 'verify_wpf_auto_login', 10, 2 );