The McDVoice survey hosted at mcdvoice.com/survey is a legitimate customer feedback program operated by McDonald’s. It allows customers to share their dining experiences and, in return, receive rewards like discounts or free menu items. To participate, you need a valid receipt with a 26-digit survey code, and the survey must be completed within seven days of your visit. Upon completion, you'll receive a validation code to redeem your offer. Be cautious of unofficial websites mimicking the McDVoice survey; always ensure you're on the official site to protect your information.