Integrate klarna via API to stripe and Shopify

Hi I'm looking for someone who knows how to integrate Klarna to my Stripe account via API and stripe.js programming codes (no need to add any products to my stripe account) everything must be able to offer Klarna payment in 3 installments and work with my Shopify account where orders are processed (I don't have a Klarna account, but I know that Stripe and Klarna can work together) in case you need I can also attach official stripe guides