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Since we can't and don't offer refunds or returns for iTunes gift cards (vouchers) it's important to know their limitations and things to look out for to avoid disappointment.
We suggest you don't try and redeem an iTunes gift card during the creation of a US iTunes account. Apple randomly selects new account creations for review that they pick up are coming from outside the US. If this happens you will be instructed to contact iTunes support which will land up with them telling you to link a valid US credit card to your account. You will lose your credit if you don't have a US credit card.
Also, if you put in an incorrect email address during the creation of a US iTunes account you will not be able to complete your account creation because you will not be able to verify your email address. If you redeemed an iTunes gift card (voucher) during the account creation and put in an incorrect email address you will lose the credit.