Turn your fast-food receipt into a free meal by visiting the official MyBKExperience.com website and sharing feedback about your drive-thru or dine-in experience. Each valid receipt entry generates a unique Burger King coupon code linked to your transaction. Write the validation code on your receipt and redeem it for a free Whopper, Original Chicken Sandwich, or breakfast Croissan'wich with the purchase of a side and drink during your next visit.