I spent a lot of trying to figure out why the app would not deduct my order from the Grubhub gift I entered into the app. It continually defaulted to my credit card. Opening a ticket with tech support was no help. No response after 3 weeks even through I followed up twice with them. I ultimately figured out on my own that the app does not accept gift cards for orders placed with on-campus restaurants. But the app doesn't tell me that.....and neither does customer/tech support.