The first thing to know about the McDonald’s app deals is that you can only use one per order. Once a deal is used, all other deals disappear from the app. The second this to know about the McDonald’s app is that the deals reappear after 15 minutes. That means that you can place an order for a $5 20-piece chicken McNuggets or a double cheeseburger and free medium soft drink from the deals tab before you leave the house, pick up the order, and then order your $1 large fry while you’re there, as one Reddit user does.
Another Redditor claims to sign in under multiple emails, though another person pointed out that the app can catch onto that and deactivate the accounts. It’s also worth noting that a strict manager can shut the whole thing down, according to Reddit thread of self-identified McDonald’s employees. If the employees notice you stacking deals and gaming the system, they can refuse to let a customer use more than one deal. And for the sake of the employees, they ask that any gamesmanship you try, you do in-store versus in the drive-thru, which has a limit of two transactions per drive-thru visit.