hs_created_by_user_id is null when I create deal using api

When I create or Update a deal using API then hs_created_by_user_id field is coming null.
but when I create or Update through UI it is coming in resonse who created or updated that field.
How should I get this through API??

Created through API

Created through UI

Hey, you are creating the the deal THROUGH the API and not through a user which explain why it’s null. What you can do is reference the source of the deal with “hs_object_source_detail_1” or “hs_object_source” to identify if it was created through the API.

I want a Id of user or Owner who created that deal

It will only be filled if you create the deal using a user not with the API because API is not a user.