Hi @rasa, thanks for your query. It should be a quite straightforward procedure to integrate the Tobii Gaze Data into your game.
We have created a tutorial for you to follow online @ https://tobii.github.io/UnitySDK/manual#integrate-the-sdk-into-your-game
Which will guide you through all the various steps required to integrate your game with Tobii. Please kindly go through this tutorial and get back to us should have any further questions on the matter.
With regards to saving the co-ordinates obtained from the eye tracker to a file, this is expressly prohibited by the Unity SDK licence agreement and requires the purchase of an ‘analytical licence’ to do. Any long term storage of gaze data is not permitted without this special licence.
You can read more @ https://analyticaluse.tobii.com/?utm_source=developer.tobii.com
Please let us know if we can be of any further help to you. Best wishes.