Docusign webhook

Certified Senior Developer

I want to send a document to recipient via DocuSign and want to retrieve by a process in Appian  after the signing .So completed event can be trigger to a webhook ( or to API) via Docusign ,But it giving the follwing error,

"Error - The remote server returned an error: (401) Unauthorized"

How can I configure  authorization in web API to trigger a process model

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