Some Chick-Fil-A receipts are printed with a coupon offering a free sandwich to customers who complete an online satisfaction survey. The coupon is only valid within two days of the original purchase, which motivates customers to do the survey quickly.
The online survey asks for the receipt's serial number to verify that the survey-taker has already purchased an item from Chick-Fil-A. The survey consists of several questions about personal satisfaction with the most recent visit to the restaurant. Questions about the perception of food quality and the restaurant's cleanliness are included. Once the survey is completed, the site provides a validation code that must be written on the receipt's coupon before using it.