The return url is built with the wrong ID

The gateway builds the return url parameterized with the plugin ID (which is always "klarna_payments") instead of using the entity ID of the gateway configuration entity. As long as you name your gateway config "klarna_payments", you won't see any problems, but as soon as you provide a different ID (like I did with "klarna_pay_later"), you will get a "page not found" error when you get redirected to your site