In the DocuSign admin module you can configure “Connect” which is a webhook your app should be listening to. In the “Connect” configuration you can enter a URL to which DocuSign then sends messages.
In your Mendix app you then create a REST service for that same URL so that you can process these messages.
The link underneath gives a lenghty explanation on what you need to do to:
High level it comes down to this:
See the documentation:
Feature: Save signed documents in your Mendix app (when using embedded signing).
Limitation: Saving documents that are signed through remote signing is not yet possible.
So it depends on how you did setup this module.