Can we send extra keys to RASA Request

Usually we send two keys to RASA 1) sender_id & 2) message My question is can we send extra keys of our choice along with these two if yes then how to retrieve this extra keys in my actions.py file.

Any suggestions are highly appreciated.

Thanks

Yes, use the metadata key and you can include anything else there and read it in action_session_start. There are docs here.