Ok, the key to this app is to not open the app directly. You must open an app that is compatible with passbook. For example, Starbucks.
When you open the Starbucks app, you can then update your information on your Starbucks account, so that gift cards, coupons, and preloaded $ are updated. Your credit card info is also an option, so that you can reload your loyalty card; you can also select specific locations.
For more info, go to
www.passsource.com. You'll also get a list of current passbook friendly apps. Good luck!