Merchant API code sample to list notification subscriptions.

### Java

    // Copyright 2025 Google LLC
    //
    // Licensed under the Apache License, Version 2.0 (the "License");
    // you may not use this file except in compliance with the License.
    // You may obtain a copy of the License at
    //
    //      https://www.apache.org/licenses/LICENSE-2.0
    //
    // Unless required by applicable law or agreed to in writing, software
    // distributed under the License is distributed on an "AS IS" BASIS,
    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    // See the License for the specific language governing permissions and
    // limitations under the License.

    package shopping.merchant.samples.notifications.v1;

    import com.google.api.gax.core.FixedCredentialsProvider;
    import com.google.api.gax.rpc.ApiException;
    import com.google.auth.oauth2.GoogleCredentials;
    import com.google.shopping.merchant.notifications.v1.ListNotificationSubscriptionsRequest;
    import com.google.shopping.merchant.notifications.v1.NotificationSubscription;
    import com.google.shopping.merchant.notifications.v1.NotificationsApiServiceClient;
    import com.google.shopping.merchant.notifications.v1.NotificationsApiServiceClient.ListNotificationSubscriptionsPagedResponse;
    import com.google.shopping.merchant.notifications.v1.NotificationsApiServiceSettings;
    import shopping.merchant.samples.utils.Authenticator;
    import shopping.merchant.samples.utils.Config;

    /**
     * This class demonstrates how to list NotificationSubscriptions for a given Merchant Center
     * account.
     */
    public class ListNotificationSubscriptionsSample {

      public static void listNotificationSubscriptions(Config config) throws Exception {

        // Obtains OAuth token based on the user's configuration.
        GoogleCredentials credential = new Authenticator().authenticate();

        // Creates service settings using the credentials retrieved above.
        NotificationsApiServiceSettings notificationsApiServiceSettings =
            NotificationsApiServiceSettings.newBuilder()
                .setCredentialsProvider(FixedCredentialsProvider.create(credential))
                .build();

        // Calls the API and catches and prints any network failures/errors.
        try (NotificationsApiServiceClient notificationsApiServiceClient =
            NotificationsApiServiceClient.create(notificationsApiServiceSettings)) {

          // The parent has the format: accounts/{account}
          String parent = "accounts/" + config.getAccountId().toString();

          ListNotificationSubscriptionsRequest request =
              ListNotificationSubscriptionsRequest.newBuilder().setParent(parent).build();

          System.out.println("Sending list Notification Subscriptions request:");
          ListNotificationSubscriptionsPagedResponse response =
              notificationsApiServiceClient.listNotificationSubscriptions(request);
          int count = 0;
          for (NotificationSubscription notificationSubscription : response.iterateAll()) {
            System.out.println(notificationSubscription);
            count++;
          }
          System.out.print("The following count of notification subscriptions were returned: ");
          System.out.println(count);

        } catch (ApiException e) {
          System.out.println(e);
        }
      }

      public static void main(String[] args) throws Exception {
        Config config = Config.load();
        listNotificationSubscriptions(config);
      }
    }

### PHP

    <?php
    /**
     * Copyright 2025 Google LLC
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     https://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    require_once __DIR__ . '/../../../vendor/autoload.php';
    require_once __DIR__ . '/../../Authentication/Authentication.php';
    require_once __DIR__ . '/../../Authentication/Config.php';
    use Google\ApiCore\ApiException;
    use Google\Shopping\Merchant\Notifications\V1\Client\NotificationsApiServiceClient;
    use Google\Shopping\Merchant\Notifications\V1\ListNotificationSubscriptionsRequest;

    /**
     * Lists Notification Subscriptions.
     */
    class ListNotificationSubscriptions
    {
        /**
         * Helper function to construct the parent resource name.
         * @param $accountId
         *  The Merchant Center account ID.
         * @return string
         *  The parent resource name.
         */
        private static function getParent($accountId)
        {
            return "accounts/" . $accountId;
        }

        /**
         * Lists Notification Subscriptions for a given Merchant Center account.
         *
         * @param array $config
         *  Configuration data for authentication and account details.
         * @throws ApiException
         */
        public static function listNotificationSubscriptionsSample($config): void
        {
            // Get OAuth credentials.
            $credentials = Authentication::useServiceAccountOrTokenFile();

            // Set up client options.
            $options = ['credentials' => $credentials];

            // Create a client instance.
            $notificationsApiServiceClient = new NotificationsApiServiceClient($options);

            // Construct the parent resource name.
            $parent = self::getParent($config['accountId']);

            // Create the request object.
            $request = new ListNotificationSubscriptionsRequest(['parent' => $parent]);

            print "Sending list Notification Subscriptions request:\n";

            // Make the API call.
            try {
                $response = $notificationsApiServiceClient->listNotificationSubscriptions($request);
                $count = 0;
                foreach ($response->iterateAllElements() as $subscription) {
                    print_r($subscription);
                    $count++;
                }
                print "The following count of notification subscriptions were returned: " . $count . "\n";
            } catch (ApiException $e) {
                print "Request failed:\n";
                print $e->getMessage() . "\n";
            }
        }

        /**
         * Execute the sample.
         *
         * @throws ApiException
         */
        public function callSample(): void
        {
            $config = Config::generateConfig();
            self::listNotificationSubscriptionsSample($config);
        }
    }

    // Run the script.
    $sample = new ListNotificationSubscriptions();
    $sample->callSample();

### Python

    # -*- coding: utf-8 -*-
    # Copyright 2025 Google LLC
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at
    #
    #     http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    """A module to list NotificationSubscriptions."""

    from examples.authentication import configuration
    from examples.authentication import generate_user_credentials
    from google.shopping.merchant_notifications_v1 import ListNotificationSubscriptionsRequest
    from google.shopping.merchant_notifications_v1 import NotificationsApiServiceClient

    _ACCOUNT = configuration.Configuration().read_merchant_info()
    _PARENT = f"accounts/{_ACCOUNT}"


    def list_notification_subscriptions():
      """Lists NotificationSubscriptions for a given Merchant Center account."""

      # Gets OAuth Credentials.
      credentials = generate_user_credentials.main()

      # Creates a client.
      client = NotificationsApiServiceClient(credentials=credentials)

      # Creates the request.
      request = ListNotificationSubscriptionsRequest(parent=_PARENT)

      print("Sending list Notification Subscriptions request:")
      # Makes the request and catches and prints any error messages.
      try:
        response = client.list_notification_subscriptions(request=request)
        count = 0
        for notification_subscription in response:
          print(notification_subscription)
          count += 1
        print(
            "The following count of notification subscriptions were returned:"
            f" {count}"
        )
      except RuntimeError as e:
        print(e)


    if __name__ == "__main__":
      list_notification_subscriptions()