Passing variables from Pre-Process to Post-Process scripts

In a DreamFactory/Bitnami instance I managed to get an Event's Pre-Process script and Post-Process script running. However, there are variables that are generated during the Pre-Process event script that need to be passed to Post-Process script for further processing.

How should I tackle this problem?

I tried to use Payload within Request object, but it is not retained between the scripts. Also after further reading I understand that Payload is not used for this purpose.

via Chebli Mohamed