Hi @infowash, and thanks for getting in touch. The custom calibration licence does come with a supplied sample code, so you should be able to get up and running relatively quickly hopefully.
Please bear in mind however that custom calibration routine does not overcome the Tobii 4C inherent screen size official limitation of 27″ 16:9 or 30″ 21:9
Workarounds however are possible as discussed @ https://developer.tobii.com/community/forums/topic/ultrawide-monitors/
To contact our Sales team regarding the purchase of the appropriate licence, please use the form @ https://developer.tobii.com/license-agreement/contact/
Do let us know if we can provide any further information. Best Wishes.