Hi Thomas,
Counter question: What have you tried or done so far to add the Ring Keypad V2?
Have you installed the Ring Security app?
Have you tried to add the device in the Devices section of the Homey smartphone app using the + and the Ring Security app?
Btw, the best place to get help for such “problems” is to visit the appropriate app topic: 
Ring Security - Extend Heimdall with Ring Security products
Read the first post and/or search for similar problems. If you cannot find anything, you can describe your problem in the same topic. I’m pretty sure that you’ll get the quickest and best help there.
