What is the best practice for adding google conversion tracking code to a specific page?
User needs it in his footer so I think you should use conditional page logic. Something like:
You can also use the post title or post slug, but id is the most reliable.
I would consider writing a shortcode. Add the following to your functions.php file. You can specify input parameters. In this case I specify id and target.
Then call it in your post like so: