Merchant API code sample to list users.

### Java

    // Copyright 2024 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.accounts.users.v1;
    import com.google.api.gax.core.FixedCredentialsProvider;
    import com.google.auth.oauth2.GoogleCredentials;
    import com.google.shopping.merchant.accounts.v1.ListUsersRequest;
    import com.google.shopping.merchant.accounts.v1.User;
    import com.google.shopping.merchant.accounts.v1.UserServiceClient;
    import com.google.shopping.merchant.accounts.v1.UserServiceClient.ListUsersPagedResponse;
    import com.google.shopping.merchant.accounts.v1.UserServiceSettings;
    import shopping.merchant.samples.utils.Authenticator;
    import shopping.merchant.samples.utils.Config;

    /** This class demonstrates how to list all the users for a given Merchant Center account. */
    public class ListUsersSample {

      private static String getParent(String accountId) {
        return String.format("accounts/%s", accountId);
      }

      public static void listUsers(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.
        UserServiceSettings userServiceSettings =
            UserServiceSettings.newBuilder()
                .setCredentialsProvider(FixedCredentialsProvider.create(credential))
                .build();

        // Creates parent to identify the account from which to list all users.
        String parent = getParent(config.getAccountId().toString());

        // Calls the API and catches and prints any network failures/errors.
        try (UserServiceClient userServiceClient = UserServiceClient.create(userServiceSettings)) {

          // The parent has the format: accounts/{account}
          ListUsersRequest request = ListUsersRequest.newBuilder().setParent(parent).build();

          System.out.println("Sending list users request:");
          ListUsersPagedResponse response = userServiceClient.listUsers(request);

          int count = 0;

          // Iterates over all rows in all pages and prints the user
          // in each row.
          // `response.iterateAll()` automatically uses the `nextPageToken` and recalls the
          // request to fetch all pages of data.
          for (User element : response.iterateAll()) {
            System.out.println(element);
            count++;
          }
          System.out.print("The following count of elements were returned: ");
          System.out.println(count);
        } catch (Exception e) {
          System.out.println(e);
        }
      }

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

        listUsers(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.
     */

    /**
     * Demonstrates how to list all the users for a given Merchant Center account.
     */

    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\Accounts\V1\ListUsersRequest;
    use Google\Shopping\Merchant\Accounts\V1\Client\UserServiceClient;


    /**
     * Lists users.
     *
     * @param array $config The configuration data.
     * @return void
     */
    function listUsers($config): void
    {
        // Gets the OAuth credentials to make the request.
        $credentials = Authentication::useServiceAccountOrTokenFile();

        // Creates options config containing credentials for the client to use.
        $options = ['credentials' => $credentials];

        // Creates a client.
        $userServiceClient = new UserServiceClient($options);

        // Creates parent to identify the account from which to list all users.
        $parent = sprintf("accounts/%s", $config['accountId']);

        // Calls the API and catches and prints any network failures/errors.
        try {
            $request = new ListUsersRequest(['parent' => $parent]);

            print "Sending list users request:\n";
            $response = $userServiceClient->listUsers($request);

            $count = 0;
            foreach ($response->iterateAllElements() as $element) {
                print_r($element);
                $count++;
            }
            print "The following count of elements were returned: ";
            print $count . "\n";
        } catch (ApiException $e) {
            print $e->getMessage();
        }
    }


    $config = Config::generateConfig();
    listUsers($config);

### Python

    # -*- coding: utf-8 -*-
    # Copyright 2024 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 users."""


    from examples.authentication import configuration
    from examples.authentication import generate_user_credentials
    from google.shopping.merchant_accounts_v1 import ListUsersRequest
    from google.shopping.merchant_accounts_v1 import UserServiceClient

    _ACCOUNT = configuration.Configuration().read_merchant_info()


    def get_parent(account_id):
      return f"accounts/{account_id}"


    def list_users():
      """Lists all the users for a given Merchant Center account."""

      # Get OAuth credentials
      credentials = generate_user_credentials.main()

      # Create a UserServiceClient
      client = UserServiceClient(credentials=credentials)

      # Create parent string
      parent = get_parent(_ACCOUNT)

      # Create the request
      request = ListUsersRequest(parent=parent)

      try:
        print("Sending list users request:")
        response = client.list_users(request=request)

        count = 0
        for element in response:
          print(element)
          count += 1

        print("The following count of elements were returned: ")
        print(count)

      except RuntimeError as e:
        print(e)


    if __name__ == "__main__":
      list_users()