Merchant API code sample to create a notification subscription.

### 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.auth.oauth2.GoogleCredentials;
    import com.google.shopping.merchant.notifications.v1.CreateNotificationSubscriptionRequest;
    import com.google.shopping.merchant.notifications.v1.NotificationSubscription;
    import com.google.shopping.merchant.notifications.v1.NotificationSubscription.NotificationEventType;
    import com.google.shopping.merchant.notifications.v1.NotificationsApiServiceClient;
    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 create a Notification Subscription for a given Merchant Center
     * account.
     */
    public class CreateNotificationSubscriptionSample {

      public static void createNotificationSubscription(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();

          // INSERT HERE the URL to be used to push the notification to.
          String callbackUri = "https://www.samplesite.com";

          // The event type to register for notifications.
          NotificationEventType eventType = NotificationEventType.PRODUCT_STATUS_CHANGE;

          // Create the NotificationSubscription object.
          NotificationSubscription notificationSubscription =
              NotificationSubscription.newBuilder()
                  // Uncomment the next line to create a notification subscription for all managed
                  // accounts.
                  // .setAllManagedAccounts(true)
                  .setTargetAccount(parent)
                  .setCallBackUri(callbackUri)
                  .setRegisteredEvent(eventType)
                  .build();

          // Create the request object.
          CreateNotificationSubscriptionRequest request =
              CreateNotificationSubscriptionRequest.newBuilder()
                  .setParent(parent)
                  .setNotificationSubscription(notificationSubscription)
                  .build();

          System.out.println("Sending create Notification Subscription request:");

          // Make the API call.
          NotificationSubscription response =
              notificationsApiServiceClient.createNotificationSubscription(request);

          System.out.println("Created Notification Subscription below:");
          System.out.println(response);
        } catch (Exception e) {
          System.out.println(e);
        }
      }

      public static void main(String[] args) throws Exception {
        Config config = Config.load();
        createNotificationSubscription(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\CreateNotificationSubscriptionRequest;
    use Google\Shopping\Merchant\Notifications\V1\NotificationSubscription;
    use Google\Shopping\Merchant\Notifications\V1\NotificationSubscription\NotificationEventType;

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

        /**
         * Creates a Notification Subscription for a given Merchant Center account.
         *
         * @param array $config
         *  Configuration data for authentication and account details.
         * @param string $callbackUri
         *  The URI to send notifications to.
         * @param int $eventType
         *  The type of event to subscribe to.
         * @throws ApiException
         */
        public static function createNotificationSubscriptionSample($config, $callbackUri, $eventType): 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 NotificationSubscription object.
            $notificationSubscription = new NotificationSubscription([
                // Uncomment to apply to all managed accounts.
                // 'all_managed_accounts' => true,
                'target_account' => $parent,
                'call_back_uri' => $callbackUri,
                'registered_event' => $eventType,
            ]);

            // Create the request object.
            $request = new CreateNotificationSubscriptionRequest([
                'parent' => $parent,
                'notification_subscription' => $notificationSubscription,
            ]);

            print "Sending create Notification Subscription request:\n";

            // Make the API call.
            try {
                $response = $notificationsApiServiceClient->createNotificationSubscription($request);
                print "Created Notification Subscription below:\n";
                print_r($response);
            } catch (ApiException $e) {
                print "Request failed:\n";
                print $e->getMessage() . "\n";
            }
        }

        /**
         * Execute the sample.
         *
         * @throws ApiException
         */
        public function callSample(): void
        {
            $config = Config::generateConfig();
            // Replace with the actual callback URI.
            $callbackUri = "https://www.samplesite.com";
            // Set the event type.
            $eventType = NotificationEventType::PRODUCT_STATUS_CHANGE;

            self::createNotificationSubscriptionSample($config, $callbackUri, $eventType);
        }
    }

    // Run the script.
    $sample = new CreateNotificationSubscription();
    $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 create NotificationSubscription."""

    from examples.authentication import configuration
    from examples.authentication import generate_user_credentials
    from google.shopping.merchant_notifications_v1 import CreateNotificationSubscriptionRequest
    from google.shopping.merchant_notifications_v1 import NotificationsApiServiceClient
    from google.shopping.merchant_notifications_v1 import NotificationSubscription

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


    def create_notification_subscription():
      """Creates a Notification Subscription for a given Merchant Center account."""

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

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

      # The callback URI to be used to push the notification to.
      callback_uri = "https://www.samplesite.com"

      # The event type to register for notifications.
      event_type = (
          NotificationSubscription.NotificationEventType.PRODUCT_STATUS_CHANGE
      )

      # Creates the NotificationSubscription object.
      notification_subscription = NotificationSubscription()
      # Uncomment the next line to create a notification subscription for all
      # managed accounts.
      # notification_subscription.all_managed_accounts = True
      notification_subscription.target_account = _PARENT
      notification_subscription.call_back_uri = callback_uri
      notification_subscription.registered_event = event_type

      # Creates the request object.
      request = CreateNotificationSubscriptionRequest(
          parent=_PARENT, notification_subscription=notification_subscription
      )

      print("Sending create Notification Subscription request:")

      # Makes the API call.
      try:
        response = client.create_notification_subscription(request=request)
        print("Created Notification Subscription below:")
        print(response)
      except RuntimeError as e:
        print(e)


    if __name__ == "__main__":
      create_notification_subscription()