Klarna - Get paid upfront and let customers shop your site freely with Klarna so they can buy what they love now and pay later. Klarna is currently available in 17 countries, including the USA, UK, Sweden and Germany.
Wix also offers other buy now pay later options including Affirm, Afterpay and Sezzle. See https://www.wix.com/ecommerce/buy-now-pay-later for more details.
