💳 Payment Simulation API (Spring Boot)

A lightweight Spring Boot API to simulate payment flows (card transactions). Designed for learning backend systems, REST APIs, and Docker.

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🚀 Features

• Simulates card-based payment transaction flow
• Validates card number, expiry, amount
• Generates transaction IDs
• REST API: POST /api/payment
• GET transaction by ID
• Includes in-memory transaction store
• Swagger integration (optional)
• Dockerized setup
• CI/CD via GitHub Actions (optional)

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🛠 Tech Stack

• Java 17
• Spring Boot
• Maven
• REST API
• Docker

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📦 API Endpoints

POST /api/payment

Request Body:

{
  "cardNumber": "4111111111111111",
  "expiryDate": "12/26",
  "amount": 250.00
}