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PaySure – Microservice-Based Payment Gateway System

Project Overview
  • Project Title: PaySure – Microservice-Based Payment Gateway System
  • Domain: Banking
  • Technology Stack: Java 17, Spring Data JPA, MySQL, HTML, CSS, React
  • Duration: 3 Weeks
Project Description

PaySure is a secure and scalable microservice-based payment gateway solution designed to handle digital transactions across various domains including e-commerce, healthcare, SaaS platforms, and financial services. Built for high availability, extensibility, and security, PaySure enables seamless integration with merchant applications, allowing users to perform real-time payments via multiple methods including cards, UPI, wallets, and net banking.

The platform ensures transaction integrity through robust authentication mechanisms and offers support for fraud detection, transaction history tracking, refunds, and payment notifications. It integrates smoothly with third-party processors like Stripe, Razorpay, and PayPal, with pluggable support for additional providers.

Key Objective
  • Facilitate Secure, Real-Time Online Payments.
  • Provide Multi-Channel Payment Support (Cards, UPI, Wallets, Net Banking).
  • Ensure PCI DSS-Compliant Transaction Handling.
  • Enable Easy Merchant Onboarding & Integration.
  • Support Refunds, Disputes, and Transaction History Tracking.
  • Offer Scalable Microservice Architecture for High Traffic Volumes.
  • Facilitate Real-Time Communication.
  • Integrate with Notification and Reporting Services.
Core Feature
  • User & Merchant Registration Module. ((Role-based access: Admins, Merchants, End Users with custom dashboards)).
  • Transaction Processing Service (Initiate, validate, and complete payments with status tracking).
  • Multi-Payment Method Integration (Support for Stripe, Razorpay, PayPal APIs).
  • Refund & Reconciliation Service (Issue full/partial refunds and maintains audit trails).
  • Fraud Detection Service (Pattern-based alerts, suspicious transaction flagging)
  • Invoice & E-Receipt Generation (Auto-generated for each transaction, sent via email/SMS)
  • Notification & Alerts Module (Transactional SMS/email updates via Twilio and Java Mail)
  • Analytics & Reporting (Charts, transaction heatmaps, success/failure trends).

Tools & Technologies Used

Category Tools / Technologies
Language Java 17
Framework SpringBoot
ORM Spring Data JPA
API Gateway Spring Cloud Gateway
Service Registry Netflix Eureka
Inter-Service Communication Feign Client, REST APIs
Payment APIs Stripe, Razorpay, PayPal SDKs
Message Queue Apache Kafka / RabbitMQ (for async events)
Notification Service Java Mail, Twilio (SMS)
Database MySQL (main database)
Authentication & Security Spring Security + JWT + OAuth2
API Documentation Swagger / SpringDoc OpenAPI
Logging & Monitoring Log4j, ELK Stack (Elasticsearch, Logstash, Kibana)
FrontEnd React.js
Building Tools & Dependencies Maven, Git, Jenkins
Cloud and Deployment AWS EC2, Docker, RDS (MySQL)

Prerequisites

💻 System Requirements
  • Operating System: Windows / macOS / Linux
  • RAM: Minimum 8 GB (16 GB recommended for microservice orchestration and containerization)
  • Java JDK 17 installed and configured
  • Node.js and npm/yarn installed for frontend (React.js)
  • Docker Desktop for containerization
  • MySQL and MongoDB installed or access to cloud instances (e.g., AWS RDS, Atlas)
  • Redis Server for caching layer
  • Apache Kafka or RabbitMQ setup for message brokering
📦 Software Dependencies
  • Java 17 + Spring Boot (backend microservices)
  • Spring Cloud (for API Gateway, Eureka, Config Server)
  • Spring Data JPA (for ORM with MySQL)
  • MongoDB Driver (for logging and audit storage)
  • Redis Client (for caching transactions and tokens)
  • Feign Client and REST APIs (inter-service communication)
  • Spring Security + OAuth2 + JWT (authentication and authorization)
  • Stripe / Razorpay / PayPal SDKs (payment gateways)
  • Java Mail, Twilio (for email/SMS notifications)
  • Swagger or SpringDoc OpenAPI (API documentation)
  • Log4j, ELK Stack (monitoring and logging)
🧰 Tools & Services
  • IDE: IntelliJ IDEA / Eclipse for backend, VS Code for frontend
  • Postman (for API testing), Mockito/JUnit (unit testing)
  • Git & GitHub for version control
  • Jenkins (for CI/CD automation)
  • Docker (to containerize microservices)
  • AWS EC2 (for deployment), AWS RDS (MySQL), AWS S3 (optional for invoices/e-receipts)
🌐 Technical Knowledge
  • Basics of Microservice Architecture and communication (REST/Feign)
  • Understanding of Payment Gateway Workflows & PCI DSS Compliance
  • Security Concepts (JWT, OAuth2, Encryption)
  • Kafka/RabbitMQ for asynchronous transaction processing
  • Monitoring tools (Kibana, Elasticsearch) for system health tracking
  • Container orchestration and deployment using Docker & AWS
  • TechnologyJava
  • TypeWeb Application
  • Duration3 weeks
  • ModeOnline/Offline
  • CertificateYes
  • Project ReviewIncluded
  • Doubt SupportLive & Chat Support
  • Career SupportResume & Interview Tips
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