I would like to purchase an app for my granddaughter as a present. She has an iPhone. How do I make the purchase and make sure she gets it? I know I can log into the app store with my wife's iCloud account, but how do I buy it and get the person to know it is available to them? Is there a way when I make the purchase I can assign it to another email address or would it have to be with the person's own iCloud account attached to it? Possibly I just use their account id without a password and when they log onto their account it would be available? I'm kind of in the dark as how this would work.