Wix has built-in functionality called "Price breakdown widget". This is a semi-static message box on the product page. The widget currently supports only Pay in X parts. It does not support Pay in 14/30 days or financing yet.
This widget is live and automatically added to Wix sites, if the region supports the Pay in X parts offering; no action needed by merchants.
Head to our marketing guidelines page to get more information on including Klarna messaging throughout your customer journey.