REST API data push into OneStream. How can we create a custom response back to the calling system

Thank You very much.  So the external system will make 2 calls to the OneStream API. 

One using the Datamanagement Step as it is doing right now and the other will be api/DataProvider/GetAdoDataSetForAdapter to get the extended result from OneStream application.

Am I summarizing it correctly?

Thank You,

Indu