Spring Payment Gateway

A minimal Spring Boot API that creates Stripe Checkout sessions for one-time payments.

Tech Stack

• Java 17
• Spring Boot 4.0.0
• Stripe Java SDK 26.8.0
• Maven

Features

• REST endpoint to create a Stripe Checkout session
• Simple amount-based payment flow
• CORS enabled for all origins

Project Structure

• src/main/java/com/example/springpayment/SpringPaymentGatewayApplication.java
• src/main/java/com/example/springpayment/controller/PaymentController.java
• src/main/resources/application.properties

Configuration

Option A: Use environment variable (recommended)

1. In src/main/resources/application.properties:

   spring.application.name=spring-payment-gateway
   stripe.secret.key=${STRIPE_SECRET_KEY}

2. In .env (ignored by git):

   STRIPE_SECRET_KEY=sk_test_...
   

Option B: Direct in properties (not recommended)

stripe.secret.key=sk_test_...

Running the App

./mvnw spring-boot:run

The app will start on http://localhost:8080.

API

Create Checkout Session

POST /api/payment/create-checkout-session

Request Body

{
  "amount": 5000
}

amount is in the smallest currency unit (e.g., paise for INR).

Response

{
  "url": "https://checkout.stripe.com/..."
}

Notes

• Currency is set to INR in the controller.
• Success and cancel URLs are currently hardcoded to:
  • http://localhost:3000/success
  • http://localhost:3000/cancel

Testing

./mvnw test