I am running the Apple TV App on my Roku. I am signed in with my Apple ID. It shows m subscriptions and shows from the iTunes Apple store I have purchased in the past. Why doesn't it show my available balance in the Apple TV App? I have $20 balance in iTunes and I thought I would be able to use that balance to rent movies on the Apple TV App. However, it only allows me to use the credit card on my account. I have a boat load of gift cards from Christmas, but I can't use them. Please help!!