Как получать отзывы о продавцах с помощью Merchant API

import com.google.api.gax.core.FixedCredentialsProvider;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.common.io.BaseEncoding;
import com.google.shopping.merchant.products.v1.GetProductRequest;
import com.google.shopping.merchant.products.v1.Product;
import com.google.shopping.merchant.products.v1.ProductsServiceClient;
import com.google.shopping.merchant.products.v1.ProductsServiceSettings;
import java.nio.charset.StandardCharsets;
import shopping.merchant.samples.utils.Authenticator;
import shopping.merchant.samples.utils.Config;

/** This class demonstrates how to get a single product for a given Merchant Center account */
public class GetProductSample {

  // Base64Url encoder/decoder without padding
  private static final BaseEncoding BASE64URL_NOPADDING = BaseEncoding.base64Url().omitPadding();

  // Encodes a string to base64url without padding
  public static String encodeProductId(String productId) {
    return BASE64URL_NOPADDING.encode(productId.getBytes(StandardCharsets.UTF_8));
  }

  public static Product getProduct(Config config, String accountId, String productId)
      throws Exception {

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

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

    try (ProductsServiceClient productsServiceClient =
        ProductsServiceClient.create(productsServiceSettings)) {

      // The name has the format: accounts/{account}/products/{productId}
      String name = "accounts/" + accountId + "/products/" + productId;

      // The name has the format: accounts/{account}/products/{productId}
      GetProductRequest request = GetProductRequest.newBuilder().setName(name).build();

      System.out.println("Sending get product request:");
      Product response = productsServiceClient.getProduct(request);

      System.out.println("Retrieved Product below");
      System.out.println(response);
      return response;
    }
  }

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

    // The name of the `product`, returned after a `Product.insert` request. We recommend
    // having stored this value in your database to use for all future requests.
    String productId = "en~GB~sku123"; // Replace with your actual product ID

    // Uncomment the following line if the product name contains special characters (such as forward
    // slashes) and needs base64url encoding.
    // productId = encodeProductId(productId);

    getProduct(config, accountId, productId);
  }
}
GetProductSample.java