Call the number on the card and tell them your problem. They can help you out by telling them the serial number (the one that starts with PBH below the code on your card).
If you can't redeem your gift card in the App Store or iTunes Store, here are some things you can try.
support.apple.com
You're only missing three digits, and I think I can make out the first two. The last one would probably be a few guesses. Do the missing digits show up better in different lighting or at a different angle? Did the ink lift up on whatever was covering up the code? You can type in the code wherever you are redeeming it; you don't need to scan it.
Btw, the card is still visible in your post. You need to delete the attachment too.