Simple Payment Gateway Backend (Go)

This is a simple backend project functioning as a payment gateway, integrated with Midtrans. It is built using Go (Golang) with a clean, production-ready architecture.

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Features

• User registration and login (JWT authentication)
• Create payment transactions (Midtrans Snap integration)
• Check transaction status
• View transaction history (for logged-in users)
• Webhook to receive payment status notifications from Midtrans
• Database schema for users, transactions, and transaction items

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Tech Stack

• Language: Go
• Web Framework: Gin
• ORM: GORM
• Database: PostgreSQL
• Payment Gateway: Midtrans
• Authentication: JWT
• Containerization: Docker

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How to Run Locally

1. Clone the Repository

   git clone https://github.com/bagussubagja/backend-payment-gateway-go.git
   cd backend-payment-gateway-go

2. Configure Environment Variables Copy the .env.example file to .env and fill in your credentials.

   cp .env.example .env

3. Install Dependencies

   go mod tidy

4. Run Database Migration (Once) Temporarily uncomment the AutoMigrate block in storage/postgres.go, then run the server to create tables. Re-comment it afterward.

5. Start the Application

   go run main.go

   The server will run at http://localhost:8080.

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Environment Variables (.env)

Make sure the following variables are set in your .env file:

• PORT: App server port (e.g., 8080)
• DB_HOST: PostgreSQL host (e.g., localhost)
• DB_PORT: PostgreSQL port (e.g., 5432)
• DB_USER: PostgreSQL username (e.g., postgres)
• DB_PASSWORD: PostgreSQL password
• DB_NAME: Database name (e.g., payment_db)
• JWT_SECRET_KEY: Secret key for signing JWT
• JWT_EXPIRATION_HOURS: Token expiration in hours (e.g., 24h)
• MIDTRANS_SERVER_KEY: Midtrans server key
• MIDTRANS_CLIENT_KEY: Midtrans client key
• MIDTRANS_ENVIRONMENT: Midtrans environment (sandbox or production)

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API Endpoints

• POST /api/v1/auth/register - Register a new user
• POST /api/v1/auth/login - Login and get JWT token
• POST /api/v1/payments/notification - Midtrans webhook notification
• GET /api/v1/profile - Get user profile
• POST /api/v1/payments/create - Create a new payment transaction
• POST /api/v1/payments/qris - Create a QRIS transaction
• GET /api/v1/payments/status/:orderID - Get transaction status by order ID
• GET /api/v1/payments/history - Get user transaction history