Can customers join a waitlist for out-of-stock products?

Yes! Waitlist notifications capture demand and ensure sales when restocking. Features include: email signup on out-of-stock products, automatic notification emails when restocked, waitlist size visibility (social proof - "127 people waiting!"), priority purchase windows (waitlist gets 48-hour head start), waitlist analytics (which products to restock urgently), and customer segmentation (waitlist subscribers are high-intent). The system prevents overselling - if 50 people waitlist but you get 20 units, only first 20 get purchase invites. This is invaluable for limited-edition products, seasonal restocks, or supply-constrained items. Waitlists show genuine demand helping inventory decisions. Conversion rates from waitlist emails are 15-25% because customers actively requested notification. The feature requires no customer action beyond email entry. It's also useful for coming-soon products allowing early interest capture.