def _build_url(self, api_call):
        """Build request url.

        Parameters:
            api_call (str): Base API Call.

        Returns:
            Complete url (str).
        """
        if self.api_version in ('1.13.0', '1.13.0+update.1', '1.13.0+update.2'):
            if '/' not in api_call:
                return "{0}/{1}/index.json".format(self.site_url, api_call)
        return "{0}/{1}.json".format(self.site_url, api_call)
Build request url.

        Parameters:
            api_call (str): Base API Call.

        Returns:
            Complete url (str).