I downloaded and setup the sample project as per the instructions from google, using their package.
Set up my certificate etc, got my plist downloaded from firebase console.
Built the app in unity, no problems.
In Xcode, added the notifications framework as instructed.
Turned on push notifications capability.
On compiling it complains about missing file
“google/protobuf/Any.pbobjc.h”
If anyone has got this working I would be most grateful if they could tell me how they did it. I’m thinking it is something to do with the way the CocoaPod stuff has set up the paths, but CocoaPods is entirely new to me today, so I’m not sure what it is doing yet.