The $mp_first_event_time property (displayed as "First Seen") is a Mixpanel-calculated reserved profile property that represents the time of the user's very first event in Mixpanel. It is automatically computed by Mixpanel and will appear in the profile data returned by the /engage API. [Reserved Properties]
If you want to limit which properties are returned in the API response (e.g., to exclude $mp_first_event_time or only retrieve specific properties), you can use the output_properties parameter in your request.
For example:
output_properties=["$last_name", "$email", "Total Spent"]
This will restrict the response to only the properties you specify. [Exporting Profiles]
Could you clarify what issue you're experiencing with the first_seen property? For example:
Are you seeing it unexpectedly and want to exclude it?
Are you getting an unexpected value?
That would help me give you a more targeted answer.
