chobie\Jira\Api::editIssue PHP Method

    public function editIssue($issue_key, array $params)
    {
        return $this->api(self::REQUEST_PUT, sprintf('/rest/api/2/issue/%s', $issue_key), $params);
    }

 /**
  * @param $jira
  */
 private function addLabels($jira)
 {
     $params = ['fields' => ['labels' => self::$labels]];
     $this->jiraClient->editIssue($jira->id(), $params);
 }