That's going to pretty much be a non-starter for most people. I'd like to use this software and I might be able to get a couple more people at my company intere

That's going to pretty much be a non-starter for most people. I'd like to use this software and I might be able to get a couple more people at my company interested, but that's not going to be enough to convince anyone to set up an on-premise server to manage the app. Perhaps you would consider a hybrid approach where the actual app connected to the API and set up the required webhooks, which your server could then use to notify the app?