How to find your firebase server key - andrehtissot/cordova-plugin-firebase-extended-notification-app-example GitHub Wiki

  1. Access https://console.firebase.google.com/
  2. Click on your firebase project, the same one that you got the "google-services.json".

  1. Click on the three dots as illustrated below.

  1. Click on the "Settings" option.

  1. Click on "CLOUD MESSAGING".

  1. Now copy the code beside "Server key".

  1. Enjoy.