The documentation for UIID: The API reference is published at uiid.linkspreed.com/api-docs.
The open-source code: Web4 Lite and the UIID Cookbook are public on GitHub.
What you get for free: UIID handles identity and sign-in, so you do not have to build authentication yourself.
Contact: [email protected], or DEV.UNITY for developer relations and regional questions.