Looks like there have been two Ring doorbell plugins - an older one by MPoulson and a more recent one by ZachBenz.
The MPoulson plugin seems to have stopped working a few years ago and is not in the Plugin Store. The ZachBenz one is still in the Plugin Store but based on forum traffic, it also seems have a stopped working for some folks and it is also marked for obsolescence beyond Indigo 2022.2.0.
It would be nice to preserve/restore this capability to Indigo.