Google Sign-In

This section will explain how to set up Google Sign-In in a project
To enable the Google Sign-In feature, you first need to go to and register your project

Create new project

In the new window, click on the "New Project" button
Then, enter the name of your project
After creating the project, go to the project settings
Go to settings "OAuth consent screen" to create OAuth
Select the External item and click on the "CREATE" button
Then you need to fill in all the required information for the project
Then click on the button at the bottom of the page. "SAVE AND CONTINUE"
Once you have filled everything in, you will have a project created, it will be in "Testing" mode, you will need to test the Google login, but in order to test, you will need to add a test user to start.
Next step: You need to create "Credentials", go to "Credentials" tab
Click on the button "CREATE CREDENTIALS"
Then select "OAuth client ID", and select Android/IOS type

Android Setup

Package name: Your application ID, you can find it in the AndroidManifest.xml file

SHA-1 certificate fingerprint

To get the SHA-1 certificate fingerprint, you need to go to the project, open a terminal, and open the android folder through the terminal
Then, you need to enter this command
./gradlew signingReport
Then in your terminal, the signingReport key will appear, select the very first "debug"

IOS setup

You can find the Bundle ID in AppStoreConnect, on the "Application Information" tab
After creating an OAuth Client ID, you can set up a project in Android Studio
Android Client ID
IOS Client ID and IOS URL scheme

Project setup

Android Setup

You need to open Android Studio, go to the project, and find the file "google_signin.dart" (lib -> data -> shared_components -> google_signing.dart), and change line 7, replace with your Android Client ID

IOS Setup

If you don't have a project in Firebase, then you need to create it: Firebase for IOS
If you have a project in Firebase then you need to find the file Info.plist (ios -> Runner -> Info.plist)
You need to replace with your IOS Client ID (Reverse Client ID or IOS URL Scheme)
Then you need to replace the GOOGLE_CLIENT_ID_IOS variable in the google_signing.dart file