Automate Docusign sending on Opp stage result

We are looking into DocuSign automated features. What we are trying to achieve is, to have the docusign template(s) be sent out to the client automatically by a trigger. The trigger could be the stage of the Opp. Or, maybe more convenient, we could create an artificial trigger with a pop up for example. There are options in what should be the trigger. However, the goal remains the same: send out the docusign templates automatically when triggered.