SAN FRANCISCO--(BUSINESS WIRE)--Affirm, the financial technology company led by PayPal Co-Founder Max Levchin, today announced that Buy with Affirm, a payment option for consumers, is now available to merchants on Shopify, a leading cloud-based multichannel platform. The integration will provide Shopify’s U.S. merchants with the ability to offer shoppers installment financing at checkout. Shopify’s platform is used by retailers to design, set up, and manage their stores across multiple sales ch