🎯 Seamless Payment Gateway Integration in Java (Spring Boot)

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🎯 Seamless Payment Gateway Integration in Java (Spring Boot) — Stripe, Razorpay, PayU in 5 Clean Steps! 🚀💳

Are you building a Java-based application that needs to support multiple payment gateways like Stripe, Razorpay, or PayU? 🎯

Here’s a clean, extensible architecture using Spring Boot that integrates all of them in just 5 solid engineering steps — with secure webhook handling, factory-based resolution, admin dashboard, and a unified transaction service.

Let’s dive in! 🔍



1️⃣ 🔗 Common Interface Layer

🎯 Goal: Abstract all payment gateway operations like pay and refund
🛠 Tech: Java, Spring Boot, Interfaces
📍 Use Case: A common interface layer that unifies gateway logic
📝 Implementation Steps:
  • Create an interface named PaymentGateway with methods: pay, refund, and verifyWebhook.
  • Define input/output DTOs like PaymentRequest, PaymentResponse, etc.
  • Implement this interface in gateway-specific classes: StripeGateway, RazorpayGateway, PayUGateway.




2️⃣ 🏭 Factory + Resolver

🎯 Goal: Dynamically pick a payment provider based on region or user
🛠 Tech: Spring Boot, Factory Pattern, YAML Config
📍 Use Case: Use Stripe in US 🇺🇸 and Razorpay in India 🇮🇳
📝 Implementation Steps:
  • Create a PaymentGatewayFactory that holds a map of provider names to implementation beans.
  • Resolve the appropriate gateway based on input like region or config.
  • Use Spring's @Service and @Component annotations to manage dependency injection.




3️⃣ 🧾 Transaction Service

🎯 Goal: Track all payments with a unified model
🛠 Tech: Spring Boot, JPA, Enum
📍 Use Case: Centralized logging and status for all payments
📝 Implementation Steps:
  • Create a Transaction entity with fields like userId, provider, amount, status, createdAt.
  • Use TransactionStatus enum for lifecycle states like INITIATED, SUCCESS, FAILED.
  • Create a TransactionService with methods to create and update transactions based on events.




4️⃣ 🔄 Webhook Handler

🎯 Goal: Securely handle real-time payment events
🛠 Tech: Spring Boot, HMAC Signature Verification
📍 Use Case: Stripe or Razorpay sends a webhook → update DB status
📝 Implementation Steps:
  • Create a REST controller at endpoint like /webhook/{provider}.
  • Verify HMAC signature using gateway-specific logic.
  • Parse the payload and extract transactionId.
  • Call TransactionService to update status in the DB.




5️⃣ 📊 Admin Dashboard + Logs

🎯 Goal: Monitor and audit all payment activity
🛠 Tech: Spring Security, JPA, Elasticsearch (optional)
📍 Use Case: View all failed PayU payments from the last 7 days 📉
📝 Implementation Steps:
  • Secure an admin-only endpoint like /admin/transactions using Spring Security.
  • Accept filters like provider, status, date range via query params.
  • Query your transaction table or Elasticsearch for analytics.




✅ Summary

This 5-step architecture ensures your Java backend is ready for clean multi-gateway payment integration with:

  • ✅ Interface-based gateway abstraction
  • ✅ Region-based dynamic resolution
  • ✅ Centralized transaction tracking
  • ✅ Secure webhook ingestion
  • ✅ Admin monitoring and analytics

Use it as a plug-and-play module in any enterprise-grade Java/Spring Boot system. ✨





📋 Want the Full Implementation?

Plz download the document from this link 👇👇👇

➡️ Click here to download the full implementation 📄

Thanks for reading! 🙌

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