That is one of the trickier aspects of running a dropshipping business. Your customers see you as the business, and so they'll expect you to handle refunds or replacements. Every supplier has different terms for returns - which means you could be out of pocket on the refund until the supplier fixes the situation on their side. Some dropshipping experts recommend that you order product samples for yourself, to decide what to carry in your store and make sure that it's quality merchandise.