Allow offers through app checkout

The app is pretty useless without the ability to order. That being said I was happy when this feature was added. Except there appears to be no way to apply a discount when ordering through the app. It has to be scanned making you only be able to use it in the store. Why not have a discount code to enter? Now I got to the store and the app keeps erroring out saying to download a new version that doesnt exist so I still cant use the coupon. Just lost time and money. ?

OrgandBlkMan about McDonald's, v5.5.1