Hi @dan10910,
Thank you for reaching out.
I understand you’re having issues with Klarna rejecting payments. Just so we can have a better understanding, are your customers getting any error messages? If any, please share a screenshot of the error message with us. You can use a screenshot sharing software like https://snipboard.io/ and share the direct link here with us.
Also, was this working correctly before? If it was, do you remember making any changes before the issue started, such as updating or installing plugin(s)?
In the meantime, please share any error logs under WooCommerce > Status > Logs. This will help investigate the issue further.