Google Firebase

Firebase App ID

1. Open Firebase.

2. Choose your project and open it.

3. Click on the "gear" and open Project Settings.

4. Find your app and Copy the App ID.

Firebase - Settings - App ID.

Firebase API Secret

1. Open Google Analytics and choose the necessary account.

2. Open Admin Settings at the bottom of the page.

3. Find Datastreams > Choose your App and open App Stream details.

4. Scroll down and in the Additional Settings click on Measurement Protocol API secrets.

5. There you will find Secret value.

Firebase API Secret