Perhaps a GDPR takeout request could answer this? Provided they’re doing things by the book.
Where it says you can email this address "dataskydd@klarna.se" if you either want them to delete your data (except data they are required to store as a bank) or if you want a print out of your personal information they store.
The matching UK site (in English) is here: https://www.klarna.com/uk/privacy-policy/ and has this email for the same purpose: "privacy@klarna.co.uk"
Ive been asking them singe GDPR took effect to provide me with all details they have about me, and to delete my account.
Not even a response.
They claim "financial institutions" are exempt due to money laundering laws.
That I understand, financial transactions they can keep, but I know a friend works there, they dont only keep financial transactions, they keep data of every website/shop I visited where they have an "integration with".