code: public function retrieveSetting($key, CachePolicy $cachePolicy = null)
      {
          $parameters = [
              'query' => [],
              'body' => json_encode([], JSON_UNESCAPED_UNICODE),
              'headers' => [],
          ];
  
          $result = $this->get('v1/accounts/settings/' . $key . '', $parameters, $cachePolicy);
  
          return $result;
      }
docs: Fetches a setting.
  
  Fetches a setting for the current user.
  
  @param string      $key         The key of the setting to fetch..
  @param CachePolicy $cachePolicy a custom cache policy used for this request only
  
  @return array