/**
  * Get statistics regarding to order's status
  */
 public static function get_statistics($account, $startDate, $endDate)
 {
     $ws_notification_activation = get_option('ws_notification_activation', array());
     $statistics = array();
     $customization = get_option('wc_sendinblue_settings', array());
     if (!isset($customization['ws_smtp_enable']) || $customization['ws_smtp_enable'] != 'yes') {
         return array();
     }
     foreach ($ws_notification_activation as $template_name) {
         /*if($template_id == '0')
           continue;*/
         $data = array("aggregate" => 0, "tag" => $template_name, "start_date" => $startDate, "end_date" => $endDate);
         $result = $account->get_statistics($data);
         $sent = $delivered = $open = $click = 0;
         foreach ($result['data'] as $data) {
             $sent += isset($data['requests']) ? $data['requests'] : 0;
             $delivered += isset($data['delivered']) ? $data['delivered'] : 0;
             $open += isset($data['unique_opens']) ? $data['unique_opens'] : 0;
             //opens
             $click += isset($data['unique_clicks']) ? $data['unique_clicks'] : 0;
             //clicks
         }
         $statistics[$template_name] = array('name' => $template_name, 'sent' => $sent, 'delivered' => $sent != 0 ? round($delivered / $sent * 100, 2) . "%" : "0%", 'open_rate' => $sent != 0 ? round($open / $sent * 100, 2) . "%" : "0%", 'click_rate' => $sent != 0 ? round($click / $sent * 100, 2) . "%" : "0%");
     }
     self::$statistics = $statistics;
     return $statistics;
 }