What is the current equivalent of the WorldManager class?

I’m currently trying to implement a mixed reality project that makes use of a World Manager class (outdated documentation here: Unity - Scripting API: WorldManager)

However this class no longer exists in the unity documentation as it seems to have been gotten rid of sometime in 2017-2018. Does anyone know what the current equivalent of this class would be? In particular I need to use the GetNativeISpatialCoordinateSystemPtr function that this class provides.

you can check this : https://forum.unity.com/threads/unityengine-xr-wsa-worldmanager-is-obsolete-what-is-the-alternative.1062509/