protected function renderPayloadDataAsMarkupList(array $data, $indent = 0) {
		$markup = '';
		foreach ($data as $key => $value) {
			$markup .= str_repeat(' ', $indent * 2) . '- ' . $key . ':';
			if (TRUE === is_array($value)) {
				$markup .= $this->renderPayloadDataAsMarkupList($value, ++ $indent);
			} else {
				$markup .= ' ' . $value . PHP_EOL;
			}
		}
		return TRUE === empty($markup) ? '' : PHP_EOL . $markup;
	}