Fix Mollie Klarna Checkout Error

I run a WooCommerce store built with the Flatsome theme and urgently need help resolving payment gateway errors at checkout. When customers choose the Mollie (Klarna) option, an error message appears and the transaction fails to complete.

Scope of work
• Diagnose the root cause of the Mollie (Klarna) error messages on the checkout page.
• Implement the necessary code or settings changes in WordPress, WooCommerce, or the Flatsome child theme to restore normal payment processing.
• Test thoroughly with live and sandbox transactions to confirm payments process and order confirmations are sent.
• Provide a concise summary of what was fixed so I can maintain it going forward.

You should have solid PHP, WordPress, WooCommerce, and Flatsome experience, plus familiarity with the Mollie API and Klarna flow. I’m looking to start immediately and will be available to supply access credentials and error logs as soon as we agree to work together.