McDonalds organises a customer satisfaction survey in the name “MCDVoice” at the official site www.mcdvoice.com. Customers who dine-in at McDonald’s restaurant will receive a printed receipt soon after the purchases. This survey code on printed receipt is mandatory in-order to take mcdvoice.com survey . After you complete your dining at food stores, make sure that you secure the McDonald's receipt at the safer place (Begin the process before the print on receipt wipes off).