Step 1: Sign in to the Firebase console, and select your project.

Step 2: Add App

Step 3: Add a new iOS app for Firebase

Now, Follow the required steps to add Firebase to your iOS app. Here are the steps:
1: Register App

2: Download config file.

3: Firebase SDK: Click 'Next' to continue

4: Initialization code: Click 'Next' to continue

5: App registration complete.

Step 4: Upload your ‘GoogleService-Info.plist’ file
- Go to Evlop mobile app's Shopify dashboard
- Account
- Edit Firebase configuration

- Select the previously downloaded ‘GoogleService-info.plist’ file and save firebase credentials.

you’ve uploaded ‘GoogleService-Info.plist’ for IOS apps.
Now you have to Connect your Firebase account with your Apple developer account: Also, you can go to Android Apps for an Android Firebase configuration.