Reup helps merchants recover sales with preorder and back in stock alerts. Add “Notify me” buttons on product and collection pages so shoppers can join a waitlist. Send automatic restock alerts by email and SMS when items return. Accept preorders for out-of-stock products, enable partial payments, and send reminders. Show low stock messages like “Hurry! Stock is low” to create urgency. Track recovered revenue and demand to plan restocks.