BNPL Application

A Buy Now Pay Later (BNPL) application built with Java and Spring Boot that allows users to make purchases on credit, manage inventory, and track order history.

Features

• Inventory Management: View and manage product inventory with sorting capabilities
• User Registration: Register users with credit limits
• BNPL Purchases: Make purchases using Buy Now Pay Later payment method
• Credit Limit Management: Automatic credit limit tracking and validation
• Order History: Track all user orders with payment methods and dates
• Dues Clearing: Clear outstanding dues and restore credit limits

Tech Stack

• Java 17
• Spring Boot 3.4.0
• Maven (Build tool)

Project Structure

src/main/java/com/nilesh/cleartrip/
├── BNPLApplication.java          # Main application logic
├── CleartripApplication.java     # Spring Boot application entry point
├── Exception/
│   ├── CreditLimitException.java
│   └── UserNotFoundException.java
└── Model/
    ├── User.java
    ├── Order.java
    ├── Item.java
    └── Product.java

Core Functionality

Inventory Management

• Seed inventory with products
• View inventory sorted by name, count, or price

User Management

• Register users with credit limits
• Track user order history

Purchase Operations

• Buy products using BNPL or regular payment methods
• Automatic inventory updates
• Credit limit validation for BNPL purchases

Dues Management

• Clear outstanding dues for specific orders
• Restore credit limits upon payment

Getting Started

Prerequisites

• Java 17 or higher
• Maven 3.6+

Building the Project

mvn clean install

Running the Application

mvn spring-boot:run

Usage Example

BNPLApplication app = new BNPLApplication();

// Seed inventory
List<Product> products = Arrays.asList(
    new Product("Laptop", 10, 50000.0),
    new Product("Phone", 20, 30000.0)
);
app.seedInventory(products);

// Register user
app.registerUser("John Doe", 100000.0);

// View inventory
app.viewInventory("price");

// Make a purchase
List<Item> items = Arrays.asList(
    new Item(new Product("Laptop", 0, 0.0), 1)
);
app.buy("John Doe", items, "BNPL", new Date());

// Clear dues
app.clearDues("John Doe", ordersToClear, new Date());

Exception Handling

The application includes custom exceptions:

• CreditLimitException: Thrown when purchase amount exceeds user's credit limit
• UserNotFoundException: Thrown when attempting operations on non-existent users

License

This project is part of the ClearTrip assignment.

Author

Nilesh Prasad

• Email: nileshprasad54321@gmail.com
• GitHub: @Kakashi54321