Customers who dine-in at a restaurant will receive a printed receipt soon after the purchases. After you complete your dining at food restaurant, make sure that you secure the McDonald's receipt at the safer place (Begin the process before the print on receipt wipes off). As mentioned, Customers need to Take this McDonald’s Customer Satisfaction Survey at www mcdvoice com . Customers of their food restaurants with their last purchased receipt are eligible for participation. Make sure the 26 digit-code printed on the receipt.