code: def unlink_user_account(self, id, provider, user_id):
          
          url = self._url('{}/identities/{}/{}'.format(id, provider, user_id))
          return self.client.delete(url)
docs: Unlink a user account
  
          Args:
              id (str): The user_id of the user identity.
  
              provider (str): The type of identity provider (e.g: facebook).
  
              user_id (str): The unique identifier for the user for the identity.
  
          See: https://auth0.com/docs/api/management/v2#!/Users/delete_user_identity_by_user_id