def _access_token(self, request: Request=None, page_id: Text='<STR_LIT>'):
if not page_id:<EOL><INDENT>msg = request.message  <EOL>page_id = msg.get_page_id()<EOL><DEDENT>page = self.settings()<EOL>if page['<STR_LIT>'] == page_id:<EOL><INDENT>return page['<STR_LIT>']<EOL><DEDENT>raise PlatformOperationError('<STR_LIT>'<EOL>'<STR_LIT>'<EOL>.format(page_id))<EOL>
Guess the access token for that specific request.