Note: You cannot create an Integrator Key with a regular DocuSign trial account. You must use a developer demo account. See the instructions in the API Quick Start section at https://www.docusign.com/developer-center/api-overview.
Follow these steps to retrieve your Integrator Key needed to create a DocuSign Element Instance. Via a web browser go to https://www.docusign.net/member/MemberLogin.aspx and log in to your account.
Click your profile in the top right corner and select “Preferences”.
If you do not have an active key, then click “Get Demo Integrator Key”
Copy “Integrator Key”