code: public Policy getSubscriptionPolicy(String subscriptionId) throws Exception {
      // [START pubsub_get_subscription_policy]
      try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
        ProjectSubscriptionName subscriptionName =
            ProjectSubscriptionName.of(projectId, subscriptionId);
        Policy policy = subscriptionAdminClient.getIamPolicy(subscriptionName.toString());
        if (policy == null) {
          // subscription was not found
        }
        return policy;
      }
      // [END pubsub_get_subscription_policy]
    }
docs: Example of getting a subscription policy.