How to pass one connection response to another connection request

Content

Hi,

Use Case:

When we click one button in VBCS, read the data from DBCS and push to external application.

I have created two connections.

1. Rest Connection - Pass the Id get the response from DBCS

2. External Connection - Pass the request

I have created one Orchestration. How to pass the Rest API response as external connection request. 

Thanks,

Mohan