All Wayback Burgers’ fans who download the new Wayback App by Monday, September 17 will be rewarded with a fantastic National Cheeseburger Day BOGO deal—a buy one, get one cheesy burger. Additionally, when you download the new Wayback App, you will be rewarded with a free classic burger after your first in-app purchase—this is outside of the National Cheeseburger Day deal. However, downloading the app prior to Tuesday, September 18 is the only way you can take advantage of the BOGO offer.
6 Deals for National Cheeseburger Day 2018
Source: https://parade.com/701132/leahingram/6-deals-for-national-cheeseburger-day-2018/