Found out in Canada the mobile app had an issue where if you clicked a promotion code, your entire order regardless of cost is $0. This lasted a couple hours and it affected all stores. Not sure if American stores got affected as well and overall impact.
FYI: I know some people in corporate that ordered hundreds of dollars of free food because of the promo code, I spoke to a worker and they said they’ve gotten a huge influx of orders because of this issue which lasted hours.