How To Install

Install by add directly in manifest.json in folder Packages/manifest.json

for version 12.4.1

"com.google.firebase.messaging": "https://github.com/firebase-unity/firebase-messaging.git#12.4.1",

dependency firebase-app 12.4.1, external-dependency-manager 1.2.183

"com.google.firebase.app": "https://github.com/firebase-unity/firebase-app.git#12.4.1",
"com.google.external-dependency-manager": "https://github.com/googlesamples/unity-jar-resolver.git?path=upm#v1.2.183",