docs: def _validate_api_params(params):
      '''
      Validate the API params as specified in the config file.
      '''
      # page_id and API key are mandatory and they must be string/unicode
      return (isinstance(params['api_page_id'], (six.string_types, six.text_type)) and
              isinstance(params['api_key'], (six.string_types, six.text_type)))