Perform As : Perform this create on behalf of a specified user. The creator and the owner of this Opportunity will default to the perform_as user. The owner can be explicitly specified in the request body if you want the owner to be a different person.
Owner : The user ID of the posting owner. The posting owner is the individual who is directly responsible for managing all candidates who are applied to that role. If no ID is provided, the posting owner defaults to perform_as.