Go to Google developer console : https://console.developers.google.com/project
Click on "create project"
Give project name : swiftlytics-demo
Click on create
Go to : https://developers.google.com/identity/sign-in/ios/start-integrating
Click Get a configuration file button
Select App name as project you created
Enter bundle identifier: com.company.swiflytics
Click next
Click enable google sign-in button
Click continue to generate configuration file
Click download `GoogleService-Info.plist`
Copy the file inside project root folder
Open plist, copy `value` of REVERSED_CLIENT_ID , it'll look something like `com.googleusercontent.apps.*`
Select project in Xcode Navigator
Click Info tab
Under URL Types click plus button
In URL Schemes paste the above copied `REVERSED_CLIENT_ID`
Change the first URL Types's URL Scheme to your bundle id (com.company.swiflytics)