If you already have the Starbucks iPhone App, you will need to push on the feature that says “add Passbook.” To pay for it, just swipe the Starbucks pass on the Passbook screen on your phone. You will then need to show the barcode that is on the screen to a Starbucks barcode reader in order to pay for your coffee.
When you go in to your local Starbucks, your phone will instantly show the Starbucks Card on your screen.
Also read: What Exactly is iPhone Passbook App in iOS 6 and How to Use it?
Starbucks also makes it possible for this technology to be used with Android phones too. The bar-coding process has been available for about a year. Starbucks says that they opted not to linger around to rollout this technology for smartphones and terminals.

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