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I'm guessing it has to be the/a credit card you used in Google Wallet. Try that, & let us know how it goes.
Why is it asking for credit card info for the $25 Google Play credit? Shouldn't that credit show up on your Google Play Wallet/account to use on Google Play? Does Google Play put $25 on one of your credit cards (a refund of sorts?) in hopes you'll use that card to made purchases on Google Play? Maybe I'm missing something?
To the OP, when you started setting up your new N7 (congratulations by the way), did the device know/ask you if you had a Google Play account? Try using the card info that may be in your Google Play account. Maybe the credit card info you put into the device does not match what's in your GP account?
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