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How do I fix the error message “401 Unauthorized” in the checkout?

Check the following:

  • If you use API-credentials for production, make sure that test mode is switched off.
  • If you use API-credentials for our test environment, make sure that the test mode is switched on.

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Copyright © 2005-2023 Klarna Bank AB (publ). Klarna Bank AB (publ) is authorised and regulated by the Swedish Financial Supervisory Authority. Deemed authorised by the Prudential Regulation Authority. Subject to regulation by the Financial Conduct Authority and limited regulation by the Prudential Regulation Authority. Details of the Temporary Permissions Regime, which allows EEA-based firms to operate in the UK for a limited period while seeking full authorisation, are available on the Financial Conduct Authority’s website. Klarna Bank AB offers both regulated and unregulated products. Klarna’s Pay in 3 instalments and Pay in 30 days agreements are not regulated by the FCA. Klarna Bank AB (publ) registered and head office: Sveavägen 46, 111 34 Stockholm, Sweden. A Swedish public limited company (publikt bankaktiebolag) registered with the Swedish Companies Registration Office with organisation number: 556737-0431.