How do I fix the error message ‘401 Unauthorized’ in the checkout?

“401 Unauthorized” errors are caused by incorrect or non-functional Klarna API credentials.

To solve, please check the following:

Ensure that your application and onboarding are complete.
Ensure that your integration is complete. Depending on your platform, you can check the Integration Guides tab of your Merchant Portal, or check your Klarna plugin that your API credentials have been entered.
If you had to manually enter your API credentials as part of your integration process, please ensure that the API credentials have all the necessary characters, and that they do not contain any extra characters like spaces.
If you use Klarna API credentials for production, make sure that the test mode is switched off.
If you use Klarna API credentials for our
test environment
, make sure that the test mode is switched on.

Still haven’t solved the issue? Contact our

Merchant Support

for further help.

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Monthly financing through Klarna and One-time card bi-weekly payments with a service fee to shop anywhere in the Klarna App issued by WebBank. Other CA resident loans at select merchants made or arranged pursuant to a California Financing Law license. Copyright © 2005-2024 Klarna Inc. NMLS #1353190, 800 N. High Street Columbus, OH 43215. VT Consumers: For WebBank Loan Products (One-Time Cards, Financing, Klarna Card): THIS IS A LOAN SOLICITATION ONLY. KLARNA INC. IS NOT THE LENDER. INFORMATION RECEIVED WILL BE SHARED WITH ONE OR MORE THIRD PARTIES IN CONNECTION WITH YOUR LOAN INQUIRY. THE LENDER MAY NOT BE SUBJECT TO ALL VERMONT LENDING LAWS. THE LENDER MAY BE SUBJECT TO FEDERAL LENDING LAWS.