docs: def send_fax(self, payload_outbox, **kwargs):  # noqa: E501
          """Send a fax  # noqa: E501
  
          With this API call you will be able to send a fax (one or more files) to one or more destinations. If you are a corporate member and you don't have a fax number set your **from** parameter to **NO_NUMBER**  # noqa: E501
          This method makes a synchronous HTTP request by default. To make an
          asynchronous HTTP request, please pass async=True
          >>> thread = api.send_fax(payload_outbox, async=True)
          >>> result = thread.get()
  
          :param async bool
          :param PayloadOutbox payload_outbox: (required)
          :return: None
                   If the method is called asynchronously,
                   returns the request thread.
          """
          kwargs['_return_http_data_only'] = True
          if kwargs.get('async'):
              return self.send_fax_with_http_info(payload_outbox, **kwargs)  # noqa: E501
          else:
              (data) = self.send_fax_with_http_info(payload_outbox, **kwargs)  # noqa: E501
              return data