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A script access manual is provided with the installation of V-Ray. It can be found at the V-Ray for SketchUp root folder:

Windows -   C:\Program Files\Chaos Group\V-Ray\V-Ray for SketchUp\extension\apidocumentation\_index.html
macOS - /Applications/ChaosGroup/V-Ray/V-Ray\ for\ SketchUp/apiextension/documentation/_index.html

Note that User data parameters are employed in the communication between V-Ray for SketchUp and its UI, whereas the actual scene parameters (V-ray core) are set accordingly only at render time.
The precise names of such user data parameters can be found in exported V-Ray files:

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