I found this binding on github for Ubiquiti APs:
I downloaded the .jar file “org.openhab.binding.unifi-2.1.0-SNAPSHOT.jar” and saved it at /openhab-share/openhab2-addons/
Now what? I can’t see the binding under “Bindings” or “Add-ons” in the paperUI backend.
I couldn’t find any conclusive tutorial for this (also, I’m a total noob). My stuff is running on a Raspberry Pi3 with the latest version of obenhabian installed.
If you’re on Windows, your openHABian should be accessible from network shares.
There’s a Samba share preconfigured.
Type \\OPENHABIANPI\openHAB-share in your explorer window’s address bar.
The credentials are openhabian and openhabian (password).
You should find openhab-addons folder inside - this is where you put your JARs.
Read more here:
https://docs.openhab.org/installation/openhabian.html
I’m on Mac, but yes, I can access the mentioned folder from my mac.
The jar has already been uploaded to “OPENHABIANPI\openHAB-share”, but my questions is: what now, how do I proceed?
I would suggest to install a Log Viewer to get you started and see what’s happening with your system directly from your browser.
Sign into your RPi through SSH and type
sudo openhabian-config
Then select Optional Components and choose Log Viewer.
After it’s installed, you should be able to access it from http://openhabianpi:9001
I don’t see any README file with *.things and *.items setup or example configuration in UniFi repo but I’m sure @mgbowman will help you with this 
Good luck!