Klarna API

Buy-now-pay-later, direct payments, and installment APIs for e-commerce.

Quick Facts

Overview

Klarna API is a payment apis provided by Klarna. Buy-now-pay-later, direct payments, and installment APIs for e-commerce. This API is designed to help developers integrate payments capabilities into their applications with minimal setup and maximum reliability.

The API supports Bearer Token authentication, ensuring secure access to all endpoints. With a transaction-fee pricing model, Klarna offers flexible options for projects of any size, from prototypes to enterprise deployments.

Klarna maintains comprehensive documentation, SDKs for popular programming languages, and active community support. The API is built on REST principles, returning JSON responses with standard HTTP status codes, making it straightforward to integrate into existing workflows.

Authentication

This API uses Bearer Token authentication. Send your API key as a Bearer token in the Authorization header of each request. The format is: Authorization: Bearer YOUR_API_KEY.

Always store your credentials securely using environment variables or a secrets manager. Never commit API keys to version control or expose them in client-side code.

Code Samples

Python

import requests
import os

API_KEY = os.environ.get("API_KEY", "YOUR_API_KEY")
BASE_URL = "https://api.klarna.com"

headers = {
    "Authorization": f"Bearer {API_KEY}",
    "Content-Type": "application/json"
}

response = requests.get(f"{BASE_URL}/v1/resources", headers=headers)
print(response.status_code)
print(response.json())

JavaScript

const API_KEY = process.env.API_KEY || 'YOUR_API_KEY';
const BASE_URL = 'https://api.klarna.com';

const response = await fetch(`${BASE_URL}/v1/resources`, {
  headers: {
    'Authorization': `Bearer ${API_KEY}`,
    'Content-Type': 'application/json'
  }
});
const data = await response.json();
console.log(data);

cURL

curl -H "Authorization: Bearer $API_KEY" \
     -H "Content-Type: application/json" \
     https://api.klarna.com/v1/resources

Go

package main

import (
    "net/http"
    "fmt"
    "io"
    "os"
)

func main() {
    apiKey := os.Getenv("API_KEY")
    if apiKey == "" {
        apiKey = "YOUR_API_KEY"
    }
    req, _ := http.NewRequest("GET", "https://api.klarna.com/v1/resources", nil)
    req.Header.Set("Authorization", "Bearer " + apiKey)
    req.Header.Set("Content-Type", "application/json")
    resp, _ := http.DefaultClient.Do(req)
    defer resp.Body.Close()
    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

Pricing

The pricing model is transaction-fee. You pay a percentage and/or fixed fee per transaction. No monthly minimums. Visit the provider’s pricing page at https://klarna.com for current rates and detailed pricing information.

Use Cases

• Integration: Connect Klarna services to your application for seamless payments functionality.
• Automation: Automate payments workflows and reduce manual operations.
• Scaling: Handle growing payments demands with Klarna’s robust infrastructure.

Related APIs

• Stripe API
• PayPal API
• Square API
• Razorpay API
• Adyen API

Further Reading

• Integration Guide
• FAQ
• Glossary