Hi @cpozo, thanks for getting in touch. I just want to confirm that you are referring to the Tobii Pro SDK Unity Bindings as outlined @
http://developer.tobiipro.com/unity/unity-getting-started.html
As this is a Tobii Pro SDK and you are an owner of a Tobii Pro device, you are entitled to premium one-to-one support.
Accordingly, Please raise a ticket with our specialist team @ https://connect.tobiipro.com/s/?language=en_US and a member of staff will get back to you promptly. Best Wishes.
That being said, for your intentions to create a heatmap and log fixations using Unity, you may need to create your own code for this purpose, but perhaps the support team is aware of existing scripts to accomplish this created by other users. Best of luck.