Google Contacts Sync with Database

I couldn't find any documentation on this.

I'm making a web app where the user can sync all of his google contacts with users within the database. (Retrieves all of the users contacts and stores them in the database then retrieves the non imported ones and stores them in their contacts without duplicates.) I've managed to do that part but I can only sync them via database, If I created or delete a user from the database the same is done with the user in the google contacts list.

Is there a way to do it through google contacts?

User DELETES contact from google contact list ---> User DELETED from database.

Thank you.