public OperationCallable<CreateSubscriptionRequest, Subscription, CreateSubscriptionMetadata>
      createSubscriptionOperationCallable() {
    throw new UnsupportedOperationException(
        "Not implemented: createSubscriptionOperationCallable()");
  }
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