code: def create_personal(cls, name, user_id, scopes=None, is_internal=False):
          
          with db.session.begin_nested():
              scopes = " ".join(scopes) if scopes else ""
  
              c = Client(
                  name=name,
                  user_id=user_id,
                  is_internal=True,
                  is_confidential=False,
                  _default_scopes=scopes
              )
              c.gen_salt()
  
              t = Token(
                  client_id=c.client_id,
                  user_id=user_id,
                  access_token=gen_salt(
                      current_app.config.get(
                          'OAUTH2SERVER_TOKEN_PERSONAL_SALT_LEN')
                  ),
                  expires=None,
                  _scopes=scopes,
                  is_personal=True,
                  is_internal=is_internal,
              )
  
              db.session.add(c)
              db.session.add(t)
  
          return t
docs: Create a personal access token.
  
          A token that is bound to a specific user and which doesn't expire, i.e.
          similar to the concept of an API key.
  
          :param name: Client name.
          :param user_id: User ID.
          :param scopes: The list of permitted scopes. (Default: ``None``)
          :param is_internal: If ``True`` it's a internal access token.
               (Default: ``False``)
          :returns: A new access token.