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My API credentials don’t work. What should I do?

If you have an issue with using API credentials you’ve generated, start trouble-shooting here:

  • Check that the test mode is disabled

  • Try copy-pasting credentials again (check there are no typos or extra spaces)

  • Verify that you’re using the correct integration (we offer 2 integrations – full checkout replacement and Klarna as a payment option within your existing checkout solution; your credentials will only work for the integration you’ve signed up for)

  • Ensure you’re not using

    when communicating with our live environment or the other way around


Still haven’t solved the issue? Contact our

for further help.

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.