Won't let me make a in-app purchase.

It keeps saying that my credit card info is invalid, but I redeemed a 15$ itunes card on my account. Last week I had also redeemed a 20$ itunes card and it let me purchase music. Today, I redeemed a 15$ itunes card and it won't let me make the in-app purchase of 11.99$.

Are you adding or changing your credit card details on your iTunes account ? If you have then each time that you do so a small temporary store holding charge may be applied to check that the card details are correct and valid and that it's registered to exactly the same name and address as on your iTunes account - it should disappear off your account within a few days or so.
Store holding charge : http://support.apple.com/kb/HT3702
And by 'won't let me make a purchase' you mean ... ?

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