Getting single participant using getParticipants call

Giving both fr_id & cons_id how can I use getParticipants api call to get single participant? I tried several values for list_filter_column but with no success.


Here is what I have:

method=getParticipants&fr_id=FR_ID&last_name=%25%25%25&api_key=****&response_format=json&suppress_response_codes=true&v=1.0&list_filter_column=cons_id&list_filter_text=CONS_ID


I'll make this request from external server side code so I need a request without auth_token.