Problem with tracking pixel

Hello,
I must add a tracking pixel code to thank you page but I try to get the tracking pixel code work…but I can’t.

The code is:
<iframe frameborder=”0″ width=”1″ height=”1″ src=”https://www.piatadigitala.ro/tracking/2/478/Orderid/CartSubtotal/cartdescription”></iframe&gt;

I must change:
– orderid
-cartsubtotal
-cartdescription

With some woocommerce function that will make this code to work.

Can anyone help me? Thank you.

[ No bumping please. ]