Docusign Integration

Did you check this link?

community.appian.com/.../integrating-with-docusign

As per Docusign documentation, when you create an Envelope there you set the signer's data, including their name, email address, and a client user ID (any alphanumeric value is suitable). So you need to get the value from Docusign or whoever did the setup in Docusign.

The Client User Id is a unique identifier set by your app to enable embedded signing for a recipient within your application.