Klarna

API

API for integrating Klarna's payment and shopping services

Overview

The Klarna Payments API enables seamless integration of Klarna’s flexible payment and shopping solutions into e-commerce platforms. Key endpoints include creating payment sessions, retrieving order details, updating transaction statuses, processing refunds, and checking payment eligibility. Responses are in JSON format. Use cases include adding Klarna’s pay-later, split-payment, or instant-payment options to checkout flows, automating transaction reconciliation, and accessing real-time order data to streamline merchant operations.

Example Integration (JavaScript)

script.js JS


fetch('https://docs.klarna.com/klarna-payments/api/payments-api/')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful architecture
JSON request/response
Payment session creation
Order management endpoints
Refund processing
Sandbox testing environment

Frequently Asked Questions

? Is Klarna API free to use?

Klarna offers a freemium model—sandbox access is free for testing, while production usage requires paid plans based on transaction volume and selected features.

? Does it require an API Key?

Yes, the Klarna API requires an API key for authentication. Developers can obtain keys via the Klarna Developer Portal after registration.

? What is the response format?

The Klarna API uses JSON for all request and response payloads, ensuring compatibility with most modern web and mobile applications.

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Tool Info

Pricing Freemium

Category Finance

Platform Public API

Pros

⊕ Seamless e-commerce integration
⊕ Multiple flexible payment options
⊕ Real-time transaction tracking
⊕ Comprehensive developer documentation

Cons

⊖ Requires API key authentication
⊖ Rate limits apply to requests
⊖ Production plans may have transaction-based costs
⊖ Regional availability restrictions