Need detailed arcore development documentation

I’m using version 4.26 of unreal. I’m using arcore plug-in to develop face capture. The tutorials and documents I found are old. The blueprint used in the document is not available in the latest version of the engine.
The following two documents have nothing to do with augmented faces
(Google’s documents haven’t been updated since 4.21 arcore was integrated into the virtual engine.)
The example project of Google ar unreal SDK on GitHub also stopped updating in the virtual engine 4.21.2. These demos are out of date. They can’t work normally, or only part of them can work normally, while the other part has no relevant information at all.
I hope to get the support of people who have been arcore Or we can discuss with each other
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