Redeeming your McDVoice validation code is quick and easy. First, visit mcdvoice.com survey and complete the customer feedback form using the survey code from your receipt. After submitting your responses, youll receive a validation code at the end of the survey. Write this code clearly on your original McDonalds receipt. Next time you visit a participating McDonalds location, present the receipt with the validation code to the cashier before ordering. The offer is usually valid for a limited time, so redeem it before the expiration date to enjoy your reward, such as a free or discounted menu item.