FinderSync check if extension is selected

I am developing a FinderSync extension and I have some issues in checking if the selection is selecting, or selecting/deselecting the extension.

Is there a way to programmatically check if a FinderSync extension is selected in System Preferences->Extensions?

Are there any API's to get notified when this selection changes?

Is there any API to select/deselect an extension, beside using the following?

system("pluginkit -e use -i com.mycompany.finderExt")

Note that I have already visited these pages:

How to enable FinderSync Extension in the System Preference in Cocoa - Objective C

OSX Finder Sync Extension

pluginkit -m -A -i com.mycompany.finderExt

If the extension is enabled, the call will return

"+ com.mycompany.finderExt(1)"

If the extension is not enabled, the call will return

"- com.mycompany.finderExt(1)"

Notice the plus and minus signs, just parse the return to determine if the extension is enabled.