I wasn’t able to find any decent documentation on this so I figured I’d throw this out there.

How to setup conversion tracking in Drupal:

1. Login to your Admin Panel>Store Administration>Configuration>

2. Click on the checkout settings block. It looks like a block of text but you can click on the whole thing.

3. In the field titled Checkout completion message header, paste the javascript/pixel in this field.

4. Above that field is a drop-down that says input format. Click it.

5. Click on allow javascript.

Done and done!