You need to follow the same process as you did when you created a “google-services.json" file in Firebase.
Here are the steps.
1. Go to https://console.firebase.google.com
2. Create a new project.
3. Add a new iOS app with your iOS app ID. Create a ticket with us
4. Download GoogleService-Info.plist file and create a ticket in the client area.
Use the Android App demo for reference
Here are the steps.
1. Go to https://console.firebase.google.com
2. Create a new project.
3. Add a new iOS app with your iOS app ID. Create a ticket with us
4. Download GoogleService-Info.plist file and create a ticket in the client area.
Use the Android App demo for reference