First off, you won't pay interest unless you carry a balance over to the next billing cycle so you don't have to pay it right after you make a purchase.
Second, your account doesn't show it, but mine on my GM Mastercard shows "Pending charges". Thats why your charge hasn't shown up yet, it's still pending. Give it a day or two then check back.
See where it says "Pending charges"?
Just wait till the payment gets approved and all the other stuff will fill in.