Channel identification using custom script in RASA

I am using a custom python script as an interface to my RASA bot and i am sending my queries via that interface to the bot using RASA model api http://localhost:5005/model/parse. I have also defined webhooks for facebook messenger in this python script. My problem is, when evaluating my users, I cannot differentiate users coming from the python interface or messenger webhook. Can anyone help me with it? Is there any way I can pass channel parameter to this api? http://localhost:5005/model/parse