🏦 Banking App API

A secure and scalable Banking API built with Spring Boot, Spring Security, and OpenAPI, featuring real-time currency updates, account management, transactions, and card services.

🚀 Features

• ✅ User Registration & Authentication (Spring Security, JWT)
• ✅ Account Management (Create, Transfer, Find Accounts)
• ✅ Card Management (Create, Credit, Debit)
• ✅ Transaction History (By Account/Card)
• ✅ Real-Time Currency Exchange Rates (Integrated with External APIs)
• ✅ OpenAPI Documentation

📂 API Endpoints

🔑 Authentication

Method	Endpoint	Description
POST	/user/register	Register a new user
POST	/user/auth	Authenticate user and get JWT token

💰 Account Management

Method	Endpoint	Description
GET	/accounts	Fetch all user accounts
POST	/accounts	Create a new account
POST	/accounts/transfer	Transfer funds between accounts
POST	/accounts/find	Find an account by details

🏦 Card Management

Method	Endpoint	Description
POST	/card/create	Create a new debit/credit card
POST	/card/debit	Debit a card
POST	/card/credit	Credit a card
GET	/card	Get card details

💱 Currency Exchange (Real-Time Updates)

Method	Endpoint	Description
GET	/accounts/rates	Fetch live exchange rates
POST	/accounts/convert	Convert currency

📜 Transaction History

Method	Endpoint	Description
GET	/transactions	Fetch all transactions
GET	/transactions/c/{cardId}	Fetch transactions by Card ID
GET	/transactions/a/{accountId}	Fetch transactions by Account ID

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🛠️ Tech Stack

• Spring Boot (Backend Framework)
• Spring Security & JWT (Authentication & Authorization)
• MySQL (Database)
• OpenAPI (API Documentation)
• RestTemplate / WebClient (Currency Exchange API)
• Docker & Cloud Run (Deployment)

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🔐 Security - Spring Security & JWT

• Uses JWT Token Authentication for securing endpoints.
• Role-based access control for Admin & User Roles.
• Passwords encrypted using BCrypt.

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⚡ Real-Time Currency Updates

This application fetches live exchange rates from an external API using RestTemplate or WebClient and updates rates dynamically.

@RestController
@RequestMapping("/accounts/rates")
public class CurrencyExchangeController {

    private final RestTemplate restTemplate = new RestTemplate();

    @GetMapping
    public Map<String, Double> getExchangeRates() {
        String apiUrl = "https://api.exchangeratesapi.io/latest?base=USD";
        ResponseEntity<Map> response = restTemplate.getForEntity(apiUrl, Map.class);
        return (Map<String, Double>) response.getBody().get("rates");
    }
}