I run all my apps through configurator at my school. I have set it up to allow in-app purchasing. I figured I would just add an itunes gift card and do the in-app purchase. I tried to add the gift card via the iPad but it won't let me sign in to iTunes. I was thinking about going to itunes store on the computer and redeem it there but wanted to see if anyone else had tried that before - I would hate to lose my money.