To participate in the Mcdonald's customer survey at official website of MCDVoice Visit www mcdvoice com within 7 days. choose en español or english. To begin the mcdonalds survey, you need to have receipt survey code. When you purchase something at the Mc’D, a valid receipt or invoice is given to you. In the middle of the mc'd receipt, you can find a 26-digit code. If you don’t have code, Click here Enter the survey code on mcdvoice.com in the 6 Boxes provided below. Then Click on Start Survey.