Offer a no-questions-asked refund window after purchase. Reduces purchase risk and lifts conversion; for software, refund rates rarely exceed 5% if product quality is real. Set the window long enough to be meaningful (30 days for SaaS, 60-90 for considered consumer purchases), display it prominently next to the checkout button, and make the refund one-click via email or in-app — friction undoes the trust signal.