Online Store Payment Integration with Klarna

This Spring Boot application provides REST APIs for integrating with Klarna Payments API for online store payment processing.

Features

• Create payment sessions
• Update payment sessions
• Get session details
• Create orders
• Cancel authorizations
• Generate customer tokens for future purchases

Technologies Used

• Java 17
• Spring Boot 3.2.3
• Spring WebFlux for reactive API calls
• Lombok for reducing boilerplate code
• SpringDoc OpenAPI for API documentation

Getting Started

Prerequisites

• Java 17 or higher
• Maven 3.6 or higher

Configuration

Configure the application by updating the application.properties file:

# Klarna API configuration
klarna.api.url=https://api.klarna.com
klarna.api.username=your_api_username
klarna.api.password=your_api_password
klarna.api.merchant.id=your_merchant_id

Building the Application

mvn clean install

Running the Application

mvn spring-boot:run

The application will start on port 8080 with context path /api.

API Documentation

Once the application is running, you can access the API documentation at:

• Swagger UI: http://localhost:8080/api/swagger-ui.html
• OpenAPI JSON: http://localhost:8080/api/api-docs

API Endpoints

Payment Sessions

• POST /api/klarna/sessions - Create a new payment session
• GET /api/klarna/sessions/{sessionId} - Get details about a session
• POST /api/klarna/sessions/{sessionId} - Update a session

Orders and Authorizations

• POST /api/klarna/authorizations/{authorizationToken}/order - Create an order
• DELETE /api/klarna/authorizations/{authorizationToken} - Cancel an authorization
• POST /api/klarna/authorizations/{authorizationToken}/customer-token - Generate a customer token

Klarna API Documentation

For more information about the Klarna Payments API, refer to the official documentation.

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.