Question Unity Ads to Levelplay scripting migration guide?

Is there an official Unity guide anywhere that details how to convert a project from Unity Ads to Levelplay? After you have all the other things set up? Specifically things like the init script and loading, showing ads. They seem to work in fundamentally different ways.

For example I have no idea what the uniqueUserId is meant to be, or how to call reward ads by ID in Levelplay code.

Other integration is fine, this is specifically a coding question.

I've gone over these scripts but need some guidance on how to upgrade from Unity Ads.
LevelPlay: https://github.com/ironsource-mobile/Mediation-Demo-Apps/tree/master/Unity/Assets/MyScripts
Unity Ads: https://docs.unity.com/ads/en/manual/UnityDeveloperIntegrations

(not Unity Mediation to Levelplay code)

 

I found this video very helpful.