I just did the Starbucks Passbook thing this morning. I added my card from my Starbucks app and sure enough it popped up during my visit to one of my local shops. It was scanned and… did not update the balance. It’s been 30 minutes now and it is still set at my previous balance. I figured it my purchase would have come off the balance immediately. I launched the Starbucks app and the balance is correct there.