code: def list_webhooks(self, scaling_group, policy):
          
          uri = "/%s/%s/policies/%s/webhooks" % (self.uri_base,
                  utils.get_id(scaling_group), utils.get_id(policy))
          resp, resp_body = self.api.method_get(uri)
          return [AutoScaleWebhook(self, data, policy, scaling_group)
                  for data in resp_body.get("webhooks", [])]
docs: Returns a list of all webhooks for the specified policy.