• Discover Klarna
  • For Business
  • Payment solutions

    Conversion features

    Marketing solutions

    Checkout solutions

    All payment solutions
    Installments
    Pay in 30 days
    Financing
    Pay in full
    Sign in with Klarna
    On-site messaging
    Express checkout
    All marketing solutions
    Ads: Programmatic
    Ads: Drive-to-store
    Search: Brand & product
    Search: Comparison shopping service (CSS)
    Affiliate: Content
    Affiliate: Cashback
    Affiliate: Creator network
    Agentic Product Protocol
    In-store
    Point of sale
  • Partners
  • Developers

    Case studies

    Merchant portal
    Klarna docs
    Operational status
    All case studies
    Expedia
    Ninepine
    Ditur
    Cole Haan
    Criteo
    Miravia
    Plein
    DocMorris
  • Merchant support
Go to portal
  1. Klarna
  2. Klarna for business
  3. Merchant support
  4. Integration

Integration

  • How can I test the Klarna integration?
  • How do I integrate Klarna?
  • Why am I sent back to the shopping cart when I try to complete the purchase in the checkout?
  • The Klarna integration is not working. What should I do?
  • I believe my API credentials are being misused. What should I do?
  • I’ve lost my Klarna API credentials. What should I do?
  • What are the Klarna API credentials and how do I use them?
  • My API credentials don’t work. What should I do?
  • How do I fix the error message ‘401 Unauthorized’ in the checkout?
  • What platforms do you work with?
  • How do I integrate my Wix site with Klarna?
  • How do I add the Klarna API credentials to my BigCommerce store?
  • How do I integrate my Shopify store with Klarna?
  • How do I integrate my BigCommerce store with Klarna?
  • How do I integrate my WooCommerce store with Klarna?
  • How do I troubleshoot Shopify errors?
  • About us
  • Careers
  • News
  • Sustainability
  • Wikipink
  • Contact for authorities
  • General Corporate
  • Customer service
  • Terms & conditions
  • Privacy policy
  • Tracking technology notice
  • Digital Services Act
  • Report phishing attempts
  • Sell with Klarna
  • Payment solutions
  • Marketing solutions
  • Merchant support
  • Business log in
  • Developers portal
  • Klarna
  • About us
  • Careers
  • News
  • Sustainability
  • Wikipink
  • Contact for authorities
  • General Corporate
  • Home
  • Customer service
  • Terms & conditions
  • Privacy policy
  • Tracking technology notice
  • Digital Services Act
  • Report phishing attempts
  • Business
  • Sell with Klarna
  • Payment solutions
  • Marketing solutions
  • Merchant support
  • Business log in
  • Developers portal
  • Market

Choose your region

Klarna offers flexible payments globally.

Australia

English

Österreich

Deutsch

België

Nederlands

Belgique

Français

Canada

English

Canada

Français

中国

中文(简体

Česká republika

Čeština

Danmark

Dansk

Suomi

Suomi

France

Français

Deutschland

Deutsch

Ελλάδα

Ελληνικά

Magyarország

Magyar

Ireland

English

Italia

Italiano

日本

日本語

México

Español

Nederland

Nederlands

New Zealand

English

Norge

Norsk

Polska

Polski

Portugal

Português

España

Español

Slovensko

Slovenčin

Sverige

Svenska

Schweiz

Deutsch

Switzerland

English

Suisse

Français

Svizzera

Italiano

United Kingdom

English

United States

English

România

Română

한국

국문

  • Follow

Copyright © 2005-2026 Klarna Bank AB (publ). Headquarters: Stockholm, Sweden. All rights reserved. Klarna Bank AB (publ). Sveavägen 46, 111 34 Stockholm. Organization number: 556737-0431

CookiesSitemapKlarna.com