KlarnaSell with KlarnaMerchant SupportTechnical and IntegrationTechnical and IntegrationTechnical and IntegrationHow do I add the Klarna badge to my available payment options? | How does the integration work? | What is the username and password that needs to be added to my platform? | I have logged in to the Merchant Portal to integrate. How does it work? | What needs to be done before I can start integrating with Klarna? | How do I fix the error message “401 Unauthorised” in the checkout?How do I add the Klarna badge to my available payment options?How does the integration work?What is the username and password that needs to be added to my platform?I have logged in to the Merchant Portal to integrate. How does it work?What needs to be done before I can start integrating with Klarna?How do I fix the error message “401 Unauthorised” in the checkout?