How to make facebook tracking Code work with cs-cart 3?

I have created order_confirmation.override.tpl file in the skins/[CUSTOMER_ACTIVE_SKIN]/customer/addons/my_changes/hooks/checkout

But upon checkout I cannot see the tracking code in the source code of the page.

What is wrong? It is suppose to work…

Here is the tracking code :

This override will only appear on the “order confirmation” page, ie. the final checkout page, which is generally landed on after the customer completes a successful payment. The code will not be generated on any other page (home, category, product, cart, checkout step 1-4, etc.)