public function unsubscribe()
    {
        $result['customers'] = 0;
        $suppressedEmails = [];

        /**
         * Sync all suppressed for each store
         */
        $websites = $this->helper->getWebsites(true);

        foreach ($websites as $website) {
            //not enabled
            if (! $this->helper->isEnabled($website)) {
                continue;
            }

            $suppressedEmails = $this->getSuppressedContacts($website);
        }
        //Mark suppressed contacts
        if (! empty($suppressedEmails)) {
            $result['customers'] = $this->emailContactResource->unsubscribe($suppressedEmails);
        }
        return $result;
    }