How to send HTTPS 200 response Immediately to When Client make POST call? in App driven Orchestratio

Summary

We are using APP DRIVEN ORCHESTRATION to Create a Purchase order

Content

My Workflow

Step 1 
- Client post the metadata to OIC Endpoint. 
Step 2 
- In the same flow, OIC makes Get call using Metadata to get PO Data. 
Step 3 
- Now, OIC process the PO data to create the PO in Oracle EBS and send Success/Failure Acknowledgement to Client. 
Step 4 
- OIC will send HTTPS 200 response after all the operation completed in OIC for Clients POST call. 

Is there any option available to send HTTPS 200 response Immediately to When Client make POST call? 

Here I have attached the Integration flow screenshot.