Until today, App Store promo codes were only redeemable in the U.S. iTunes Store, meaning those of us in other countries and without a U.S. iTunes account were unable to take advantage of promo code distributions and giveaways.
Apple has now made developers aware that promo codes are no longer limited to U.S. customers, and that they can now be redeemed in any App Store.
Your promo code distribution is no longer limited to U.S. customers. Promo codes in iTunes Connect can now be redeemed by all App Store customers worldwide. Your Team Agent can request 50 codes per version of your app in iTunes Connect and your customers can redeem these codes in any App Store. To learn more about requesting promo codes in iTunes Connect, see the iTunes Connect Developer Guide.