docs: def _message_from_token(self, token: Text, payload: Any) \
              -> Optional[BaseMessage]:
          """
          Analyzes a signed token and generates the matching message
          """
  
          try:
              tk = jwt.decode(token, settings.WEBVIEW_SECRET_KEY)
          except jwt.InvalidTokenError:
              return
  
          try:
              user_id = tk['fb_psid']
              assert isinstance(user_id, Text)
              page_id = tk['fb_pid']
              assert isinstance(page_id, Text)
          except (KeyError, AssertionError):
              return
  
          if self.settings()['page_id'] == page_id:
              return self._make_fake_message(user_id, page_id, payload)