06.06.2011 17:05 Uhr, Quelle: The Unofficial Apple Weblog
How to check if an Apple promo code has been used or not
App developers often share promo codes with reviewers, forums, etc. Unfortunately, Apple doesn't provide a way to track which codes have been used, resulting in wasted promotions. Fortunately, Kam, the developer of Walkabout, explains how to determine if a code is still available via iTunes.
Kam's procedure is simple but effective. First, he writes, launch iTunes and log out. Next, log back in being careful not to click Save Password. Then, quit and re-open iTunes.
With iTunes running, try to redeem a promo code you'd like to test. If the code has been used, iTunes will display a message saying, "This code
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