Duo enables e-commerce stores to implement a post-purchase referral program with cashback. After making a purchase, customers receive a unique discount code to share. When this code is used by another customer, the original customer earns cashback on their order. Store owners can customize the messaging and appearance of widgets, referral emails and texts sent to customers, ensuring brand consistency. Duo seamlessly integrates with Shopify, automation, and analytics tools, helping stores track, analyze, and optimize their referral strategies to boost customer acquisition and retention.