public function apiUrl(array $query = []) {
		$url = $this->_protocol() . static::API;

		if ($this->_runtimeConfig['map']['api']) {
			 $query['v'] = $this->_runtimeConfig['map']['api'];
		}
		if ($this->_runtimeConfig['key']) {
			$query['key'] = $this->_runtimeConfig['key'];
		}

		if ($this->_runtimeConfig['language']) {
			$query['language'] = $this->_runtimeConfig['language'];
		}

		if ($query) {
			$query = http_build_query($query);

			$url .= '?' . $query;
		}

		return $url;
	}