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What would be a good way for users to enter a promo code in an iOS app?

• I am developing a game in which users can purchase items with virtual coins. Coins can be obtained either by in-app purchase or custom promo codes. Is there an easier way for users to enter a promo code, other than typing it in manually? Is it worth implementing a barcode/QR code reader in the app? If not, what is the best way to generate promo codes that are human-readable, preferrably English words that are somehow related to the app's theme?

• Answer:

  Personally, I love the barcode/QR idea but I am kinda tech geeky. However, I am not sure how that would work However, for my iPhone when I grab codes off places like http://www.MoneyNing.com, I do not hand type them in. I simply cannot remember the code. Therefore, I double tap the code so it highlights and copy paste the code in. If this does not work, I reluctantly type the code in to the promo code box. Therefore, my suggestion is to make the promo code be copy/paste-able. This prevents any mistakes in copying and makes it easier on everyone. No one likes the "invalid promo code" error message.