code: def update(self, batch_webhook_id, data):
          
          self.batch_webhook_id = batch_webhook_id
          if 'url' not in data:
              raise KeyError('The batch webhook must have a valid url')
          return self._mc_client._patch(url=self._build_path(batch_webhook_id), data=data)
docs: Update a webhook that will fire whenever any batch request completes
          processing.
  
          :param batch_webhook_id: The unique id for the batch webhook.
          :type batch_webhook_id: :py:class:`str`
          :param data: The request body parameters
          :type data: :py:class:`dict`
          data = {
              "url": string*
          }