Hello Subha,
The routing on this becomes pretty complicated pretty quickly. You can do an enhanced SSO style workflow https://docs.q2developer.com/guides/frontend_development/enhanced_sso.html To do this with docusign because you most likely can't change the javascript on Docusign's page. You could do a jumper page that adds the needed javascript to make this work. Once it returns from the overpanel you do get a function call on the javascript. You can see that here: https://tecton.q2developer.com/capabilities/showOverpanel
You might have to be slightly creative to get all this to work. That should be most of the pieces you need though.
Thank you,
Trey Teter
Software Engineer