private function newsletterOptInConfirm()
 {
     $oSubscriberGroupMembership = SubscriberGroupMembershipQuery::create()->filterByOptInHash($_REQUEST[self::PARAM_OPT_IN_CONFIRM])->findOne();
     // If subscriber exists and the required checksum is correct
     if ($oSubscriberGroupMembership) {
         SubscriberGroupMembershipPeer::ignoreRights(true);
         $oSubscriberGroupMembership->setOptInHash(null);
         $oSubscriberGroupMembership->save();
         return $this->constructTemplate('newsletter_optin_confirm');
     }
 }