$cache->save($cacheCalendars);
 
                                                //Drop token and report
+                                               //XXX: submit app to avoid expiration
+                                               //XXX: see https://console.cloud.google.com/apis/credentials/consent?project=calendar-317315
                                                echo 'Token '.$tokenId.' for calendar '.$token['calendar'].' has expired and is not refreshable'."\n";
 
                                                //Return failure