Customify is a Shopify product customizer app that lets merchants sell personalized products through configurable text, image, and design options. It is useful for print on demand shops, gift stores, apparel sellers, and agencies building custom commerce workflows. Affiliates can promote the app in Shopify app comparisons, personalization tutorials, and product customization guides. Its affiliate program offers commissions when visitors upgrade to a paid plan, offers 20% recurring commission on monthly subscription payments, and explains that commissions continue as long as referred merchants remain subscribed.