Techzy Backend (MERN)

🔥 Server-side REST APIs with Node.js, Express, MongoDB, SSLCommerz, Stripe & Automated Transaction Mailers

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🌈 About Techzy Backend

Handles all server-side operations, transactional workflows, payment gateways, and data integrity controllers for the Techzy E-commerce platform:

• 💳 Dual-Payment Gateways: Stripe checkout + SSLCommerz local payment gateway integration.
• 📨 Nodemailer Transaction Emailer: Fully automated mail server that delivers beautiful industry-standard purchase summaries to users upon successful payment confirmation.
• 🔐 JWT Session Middleware: Secure cross-origin cookie/local token signatures with role-based admin validation guards.
• 🚀 Auto-Database User Sync: Automatically provisions user records inside MongoDB upon Firebase Google OAuth registration.
• 📦 API Controllers: Managed routes for product CRUD, user database indexing, and automated subscriber lists.

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🛠️ Backend Tech Stack

Server Framework:   Node.js • Express.js
Database:           MongoDB (Mongoose / Native Driver)
Session Auth:       Firebase Admin SDK • JsonWebToken (JWT)
Payment Systems:    Stripe Core API • SSLCommerz Merchant Gateway
Email Automation:   Nodemailer (SMTP Relay Client)
Security:           CORS Guards • Dotenv Environment Managers

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⚙️ Core Architecture & Enhancements

1. Payment Processing (src/controllers/payment.controller.js)

• Integrated SSLCommerz merchant payment credentials along with standard Stripe API hooks.
• Configured dynamic payment init callback endpoints (/payment/ssl-init), IPN (Instant Payment Notification) listener validation routes, and routing callbacks.

2. Transaction Emailer System (src/services/email.service.js)

• Built an SMTP mailer pipeline utilizing Nodemailer.
• Delivers a structured, premium invoice table detailing purchased items, customer info, transaction IDs, and receipt links automatically upon payment hook resolution.

3. Middleware Security & Identity Validation

• Integrated route verifiers (verifyToken & verifyAdmin) to secure dashboard analytics and catalog mutating operations.

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🚀 Getting Started

1. Clone the repository:

   git clone https://github.com/tuhin360/techzy.git
   cd techzy-server

2. Install dependencies:

   pnpm install

3. Create a .env configuration file:

   PORT=5000
   DB_USER=yourMongoUser
   DB_PASSWORD=yourMongoPassword
   JWT_SECRET=yourJwtSecret
   STRIPE_SECRET_KEY=yourStripeSecretKey
   STORE_ID=yourSSLCommerzStoreId
   STORE_PASSWORD=yourSSLCommerzStorePassword
   IS_LIVE=false
   EMAIL_USER=yourSMTPAuthEmail
   EMAIL_PASS=yourSMTPAuthPassword

4. Run in development mode:

   pnpm dev

   The server runs locally at http://localhost:5000.