Klarna and Clearpay are the two biggest Buy Now Pay Later services in the UK, both offering interest-free instalment payments at checkout. Both carry real risks if payments are missed.
Klarna is a legitimate FCA-regulated financial service, not a scam. However, Buy Now Pay Later is a form of debt, and Klarna now reports missed payments to UK credit reference agencies. Use only if you are confident you can repay on time.
Clearpay is a legitimate Buy Now Pay Later service owned by Block Inc (Jack Dorsey's company). The pay-in-4 instalment model works as advertised, but missed payments incur fees and may affect your credit score. Use it only if you can reliably repay on schedule.