• Overview
• Features
• Technology used
• Importand Endpoints
• Project Structure
• How to run

A simple and secure Spring Boot based payment transfer service that allows users to transfer funds between accounts within a digital banking platform. This service includes robust error handling and transaction logging to ensure data integrity and traceability.

• Secure Transfers: Enables users to move funds from one internal account to another.

• Validation: Ensures the source account has sufficient funds and prevents illogical transactions (e.g., same-source and destination).

• Transaction Recording: All transfers are logged for compliance, reporting, and audit purposes.

• Error Handling: Graceful and consistent error messages.

• Backend Framework: Spring Boot (v 3.5.3)
• Language: Java 17+
• Data Layer: Spring Data JPA
• Database: H2 In-Memory Database
• Build Tool: Maven

• Transfer funds:

Endpoint: POST /transfer Sample Request:

{
  "sourceAccountId": 1,
  "destinationAccountId": 2,
  "amount": 20
}

Typical Responses:

• 200 OK: Transaction successful
• 404 Not Found: Account does not exist
• 400 Bad Request: Invalid input (e.g. negative amount)
• 406 Not Acceptable: Insufficient funds

src/
├── configuration/          # Global configs, interceptors, and filters
├── controller/             # REST controllers
├── service/                # Business logic
├── repository/             # Spring Data repositories
└── model/                  # Entity definitions

Run the Application:

git clone https://github.com/your-username/payment-transfer-system.git
cd payment-transfer-system
mvn spring-boot:run

Application will start at URL: http://localhost:8080