You can implement Google Sign-in for your Google Nest setup by integrating Google Identity Services (GIS) into your app. Go to the Google Cloud Console and create a new project or select an existing one. Then, enable the Google Sign-in API under APIs and Services and configure the OAuth consent screen. Go to the OAuth consent screen and configure the app details. Select “External” if your app will be used publicly. Once configured, you can authenticate users seamlessly, ensuring security and convenience. If there are any quality issues, I have described them here https://google-nest.pissedconsumer.com/customer-service.html . and they answered me
