I run a zen cart site and I need to place the tracking pixel from the affiliate network on my zen cart "thank you for your order" page. I'm using a custom theme and cannot find where to put this pixel code?

Also, can I just echo $zv_orders_id in the pixel code to pass the transaction id through the pixel code?

Any help is appreciated, I have searched the forums and was surprised there isn't much on this issue. (Unless I'm just searching for the wrong terms?)