Google Wallet Card Question

So a question about the Google Wallet card, for those who have looked into it or who have used it already. I'm thinking about getting one to experiment with and see how it all works, but they are asking for my full SSN. Does anybody know if they run a credit check for the card? It would seem counter to the fact that it's a debit card, so I was hoping to hear from somebody who has the card so I can figure out what the deal is. Thanks!