Oh goodness! I do apoligize! Here I am trying to act dumb and just playing around.
I had no idea you were serious, Sneakers. It certainly wasn't a dummy question if you meant it sincerely. I was fooling with JoanG's "certified (not certifiable)" remark in her post. That's why I said "dummy" instead of dumb. Please reread what I wrote and I hope you'll realize I was trying to be funny! I must have missed the boat entirely. Sorry.
Now, on a SERIOUS note, I don't think it's a credit card, I think it's a discount card you show at time of purchase and they'll deduct some % of your total, before taxes, at the register.