public function getTheme($themeId, $fields = ['name', 'slug', 'url'])
    {
        $apiUrl = $this->getEndpoint('themes');
        $apiUrl .= $themeId;

        $params = array(
            'fields' => implode(',', $fields)
        );

        $apiData = $this->apiGet($apiUrl, $params);

        return $this->decodeSingle($apiData);
    }