Once the user has selected "Sign in with Google" he gets a form to enter the required credentials, as should be explained here :
https://developers.google.com/identity/sign-in/web/sign-in
This should trigger the "google" account creation process (To be completed).
Once the user has selected "Sign in with Google" he gets a form to enter the required credentials, as should be explained here : https://developers.google.com/identity/sign-in/web/sign-in This should trigger the "google" account creation process (To be completed).