
Klarna payment and shopping service.
Klarna API is a free Finance API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from docs.klarna.com.

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The Klarna API is provided by Klarna (docs.klarna.com).
Yes. The Klarna API is listed in the Finance category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Klarna API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Klarna API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Klarna API is served over HTTPS, so it's safe to use in production.