Apologies for the delayed response.
Could you clarify your definition of a "campaign"? Are you referring to marketing email campaigns?
Also, by "responses," are you looking for actual email replies, or just opens and clicks?
If you are trying to retrieve marketing email open and click information for each recipient, this endpoint can be used effectively.
To advise effectively, however, I need to know exactly what you're querying from the API, for example:
and what you are expecting to receive.
Screenshots of the response do not help me on their own. I need to know the full request URL.