Merchant API code sample to list quota.

### 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.quota.v1;

    import com.google.api.gax.core.FixedCredentialsProvider;
    import com.google.auth.oauth2.GoogleCredentials;
    import com.google.shopping.merchant.quota.v1.ListQuotaGroupsRequest;
    import com.google.shopping.merchant.quota.v1.QuotaGroup;
    import com.google.shopping.merchant.quota.v1.QuotaServiceClient;
    import com.google.shopping.merchant.quota.v1.QuotaServiceClient.ListQuotaGroupsPagedResponse;
    import com.google.shopping.merchant.quota.v1.QuotaServiceSettings;
    import shopping.merchant.samples.utils.Authenticator;
    import shopping.merchant.samples.utils.Config;

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

      public static ListQuotaGroupsPagedResponse listQuotas(String accountId) throws Exception {
        GoogleCredentials credential = new Authenticator().authenticate();

        QuotaServiceSettings quotasServiceSettings =
            QuotaServiceSettings.newBuilder()
                .setCredentialsProvider(FixedCredentialsProvider.create(credential))
                .build();

        try (QuotaServiceClient quotaServiceClient = QuotaServiceClient.create(quotasServiceSettings)) {

          ListQuotaGroupsRequest request =
              ListQuotaGroupsRequest.newBuilder()
                  .setParent(String.format("accounts/%s", accountId))
                  .build();

          System.out.println("Sending list quotas request:");
          ListQuotaGroupsPagedResponse response = quotaServiceClient.listQuotaGroups(request);

          int count = 0;

          // Iterates over all rows in all pages and prints the quota group in each row.
          // Automatically uses the `nextPageToken` if returned to fetch all pages of data.
          for (QuotaGroup quota : response.iterateAll()) {
            System.out.println(quota);
            count++;
          }
          System.out.print("The following count of quota were returned: ");
          System.out.println(count);
          
          return response;
        }
      }

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

### 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\Quota\V1\Client\QuotaServiceClient;
    use Google\Shopping\Merchant\Quota\V1\ListQuotaGroupsRequest;

    /**
     * This class demonstrates how to list quota for a given Merchant Center account.
     */
    class ListQuotaSample
    {

        /**
         * A helper function to create the parent string.
         *
         * @param string $accountId
         *      The account that owns the quota.
         *
         * @return string The parent has the format: `accounts/{account_id}`
         */
        private static function getParent(string $accountId): string
        {
            return sprintf("accounts/%s", $accountId);
        }


        /**
         * Lists quotas for a given Merchant Center account.
         *
         * @param string $accountId
         *      The Merchant Center account ID.
         * @throws ApiException
         */
        public static function listQuotas(string $accountId): 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.
            $quotaServiceClient = new QuotaServiceClient($options);

            // Creates the parent resource name.
            $parent = self::getParent($accountId);

            // Creates the request.
            $request = new ListQuotaGroupsRequest(['parent' => $parent]);

            print "Sending list quotas request:\n";

            // Calls the API and catches and prints any network failures/errors.
            try {
                $response = $quotaServiceClient->listQuotaGroups($request);

                $count = 0;

                // Iterates over all rows in all pages and prints the quota group in each row.
                foreach ($response->iterateAllElements() as $quota) {
                    print_r($quota);
                    $count++;
                }
                print "The following count of quota were returned: ";
                print $count . "\n";
            } catch (ApiException $e) {
                print "Failed to list quota.\n";
                print $e->getMessage() . "\n";
            }
        }

        /**
         * Helper to execute the sample.
         * @throws ApiException
         */
        public function callSample(): void
        {
            $config = Config::generateConfig();
            self::listQuotas($config['accountId']);
        }
    }

    // Run the script
    $sample = new ListQuotaSample();
    $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 quota for a given Merchant Center account."""

    from examples.authentication import configuration
    from examples.authentication import generate_user_credentials
    from google.shopping import merchant_quota_v1


    def list_quotas(account_id: str):
      """This class demonstrates how to list quota for a given Merchant Center account."""

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

      # Creates a client.
      client = merchant_quota_v1.QuotaServiceClient(credentials=credentials)

      # Creates the request.
      parent = f"accounts/{account_id}"
      request = merchant_quota_v1.ListQuotaGroupsRequest(parent=parent)

      print("Sending list quotas request:")
      # Makes the request.
      try:
        response = client.list_quota_groups(request=request)

        count = 0

        # Iterates over all rows in all pages and prints the quota group in each
        # row. Automatically uses the `next_page_token` if returned to fetch all
        # pages of data.
        for quota in response:
          print(quota)
          count += 1
        print("The following count of quota were returned: ")
        print(count)
        return response
      except RuntimeError as e:
        print(e)
        raise


    if __name__ == "__main__":
      _account_id = configuration.Configuration().read_merchant_info()
      list_quotas(_account_id)