That’s right. My plugin works like Google/Facebook Authentication.
In your workflow, you use the action “Signup/login with a social network” and choose this plugin. That’s all you need to do. No complex workflows.
The user will be presented with a signup/login page where he/she will need to validate the email address. When the user validates the email address, he/she is sent back to the page where he/she was coming from. If the user didn’t exist already, the user is created in the database (a signup). If the user did exist, then the user is logged into the app (a login).