1. Apply for V3 credentials from Klarna
2. Order a V3 Talex/Klarna integration via https://webshop.talex.se/klarna-checkout-upgrade-p-440.html?language=en
3. After Talex have confirmed that they have changed you can enter your new credentials as below.
In your Talex admin click on
Click on Edit (right hand side of page)
Paste or carefully enter your credentials.
Make sure the module is active and in production mode
Tips: Make a test purchase in Production mode to check that everything is working correctly.
Contact us at firstname.lastname@example.org if you need help.