The $10 promotion card didn't get used. According to Google Wallet (Google Wallet - how it works) you can buy things online if you "Look for either of these buttons at checkout." Those buttons happen to be the google checkout and google wallet buttons. I used google checkout and it didn't let me use my $10 promotion card.
I'm wondering if the promotion card is stored on the phone ONLY, since I can't see the promotion card in my google wallet account, but I can see it on my phone still.
Included are some screen shots.