luos/workflow/engine/methods/cases/derivatedGmail.php

<?php 
$licensedFeatures = & PMLicensedFeatures::getSingleton();
if (!$licensedFeatures->verifyfeature('7qhYmF1eDJWcEdwcUZpT0k4S0xTRStvdz09')) {
    G::SendTemporalMessage( 'ID_USER_HAVENT_RIGHTS_PAGE', 'error', 'labels' );
    G::header( 'location: ../login/login' );
    die;
}
$caseId = $_SESSION['APPLICATION'];
$usrUid = $_SESSION['USER_LOGGED'];
$usrName = $_SESSION['USR_FULLNAME'];
$actualIndex = $_SESSION['INDEX'];
$cont = 0;

use \ProcessMaker\Services\Api;
$appDel = new AppDelegation();

$actualThread = $appDel->Load($caseId, $actualIndex);
$actualLastIndex = $actualThread['DEL_PREVIOUS'];

require_once (PATH_HOME . "engine" . PATH_SEP . "classes" . PATH_SEP . "class.labelsGmail.php");
$oLabels = new labelsGmail();
$oLabels->addRelabelingToQueue($caseId, $actualIndex, $actualLastIndex, false);

G::LoadClass( "pmGoogleApi" );
$pmGoogle = new PMGoogleApi();
if(array_key_exists('gmail', $_SESSION) && $_SESSION['gmail'] == 1 && $pmGoogle->getServiceGmailStatus() ){
	$_SESSION['gmail'] = 0;
	unset($_SESSION['gmail']); //cleaning session
	$mUrl = '/sys'. $_SESSION['WORKSPACE'] .'/en/'.$_SESSION['currentSkin'].'/cases/cases_Open?APP_UID='.$caseId.'&DEL_INDEX='.$actualIndex.'&action=sent';
} else{
	$mUrl = 'casesListExtJs';
        if (isset($_SESSION["currentSkin"]) && $_SESSION["currentSkin"] === 'uxs') {
            $mUrl = '../home';
        }
}

header( 'location:' . $mUrl );