public OperationCallable<DeleteSubscriptionRequest, Empty, DeleteSubscriptionMetadata>
      deleteSubscriptionOperationCallable() {
    throw new UnsupportedOperationException(
        "Not implemented: deleteSubscriptionOperationCallable()");
  }
Base stub class for the SubscriptionsService service API.

<p>This class is for advanced usage and reflects the underlying API directly.
java-workspaceevents/google-cloud-workspaceevents/src/main/java/com/google/apps/events/subscriptions/v1/stub/SubscriptionsServiceStub.java