code: def token_payload(self) -> TokenPayload:
      assert self._token is not None
      return get_token_payload(self._token)
  
imports: from __future__ import annotations
  import logging
  import weakref
  from typing import TYPE_CHECKING, Any, Awaitable, Callable, Iterable
  from tornado import gen
  from ..application.application import ServerContext, SessionContext
  from ..document import Document
  from ..protocol.exceptions import ProtocolError
  from ..util.token import get_token_payload
  from .session import ServerSession
label_desc: Use image node_id 6 for calling the BokehSessionContext obj's underlying member method code with example usage: obj.token_payload() and returns: get_token_payload