code: public final ListSubscriptionsPagedResponse listSubscriptions(String project) {
      ListSubscriptionsRequest request =
          ListSubscriptionsRequest.newBuilder().setProject(project).build();
      return listSubscriptions(request);
    }
docs: Lists matching subscriptions.
  
  <p>Sample code:
  
  <pre><code>
  try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
  ProjectName project = ProjectName.of("[PROJECT]");
  for (Subscription element : subscriptionAdminClient.listSubscriptions(project.toString()).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param project The name of the project in which to list subscriptions. Format is
  `projects/{project-id}`.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails