Fantastic and BIG thanks - just what I needed and now my Homeys talk to each other without any hassle or problem. Works beautifully!
Going thru your instructions and doing the Flow of the receiver (When…- Logic - A Webhook has been received), I noticed that Then…- Logic - Make a web request was also available under Logic. I was able to use that on the Sender Homey - that way I didn’t need the app HTTP requeset flow cards (although I’m sure the app is more flexible and capable judging from your screenshot - but for now the Logic was enough for me; keep it simple…).
Thanks again!