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Google Checkout was officially retired by Google in 2013 and replaced by the modern Google Pay API. The original, community-supported google-checkout-java-sdk is completely deprecated and should not be used for modern web applications.

If you are building a new web application today, you should implement the Google Pay API JavaScript library on your frontend and handle the payment authorization securely on your Java backend using a payment gateway SDK (like Stripe, CyberSource, or Adyen).

The layout below outlines the modern approach to integrating Google’s payment ecosystem into a Java web application. Step 1: Set Up the Frontend (Google Pay JavaScript API)

Google Pay handles the customer-facing UI on the client side. You must load the Google Pay JavaScript library to render the payment button and request a secure payment token.

Load the script: Include the Google script on your checkout page:

Use code with caution.

Initialize the client: Define the API version and your supported payment methods.

Request a token: Configure the tokenization specification to match your backend payment gateway (e.g., Braintree, Stripe).

Pass to backend: Once the user authorizes the payment, Google returns an encrypted payload (paymentToken). Send this token to your Java backend via an asynchronous POST request. Step 2: Handle the Payment on the Java Backend

Your Java web application serves as the secure layer that passes Google’s encrypted token to your chosen payment processor.

Add Gateway Dependencies: Instead of a Google Checkout SDK, add your payment processor’s SDK to your pom.xml (Maven) or build.gradle (Gradle). For example, using Stripe:

com.stripe stripe-java LATEST Use code with caution.

Process the Token: Create a server endpoint (e.g., using Spring Boot or Jakarta Servlets) to receive the token payload:

@PostMapping(“/api/checkout”) public ResponseEntity processPayment(@RequestBody PaymentRequest request) { // 1. Extract the payment token received from the frontend client String googlePayToken = request.getGooglePayToken(); // 2. Use your payment provider’s SDK to process the charge // (The provider automatically decrypts the Google Pay token on their servers) boolean success = MyPaymentGateway.charge(googlePayToken, request.getAmount()); if (success) { return ResponseEntity.ok(“Payment successful”); } return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(“Payment failed”); } Use code with caution. Step 3: Configure the Google Pay & Wallet Console

Before you can process live production transactions, you must register your web application.

Register your domain: Sign in to the Google Pay & Wallet Console.

Request Production Access: Test your web environment using the TEST environment mode. Once validated against the Google Pay Integration Checklist, submit your domain for production approval to receive a live Merchant ID. Alternate Context: Third-Party APIs

If your query was actually referring to a specific third-party provider that has a similar name (such as the separate payment gateway company Checkout.com), they do maintain an active Checkout.com Java SDK for server-side processing.

If you would like to proceed with setting up your payment stack, let me know:

Which payment gateway/processor (Stripe, Braintree, Checkout.com, etc.) you intend to use to clear the credit cards.

What Java framework your web application relies on (e.g., Spring Boot, Jakarta EE/Servlets).

I can then provide the precise frontend and backend code blocks to map them together. Adding support for Google Pay within Android WebView