How to send email to signer after request a signature through your app (embedded signing)

I'm using embedded signing in my app. It redirects from my web page to the DocuSign signing page, and after the user finishes signing, it redirects back to my web page. I want users to receive a completion email once they've signed, just like when they sign via email. Is that possible?  Do I need to modify the code, or can I do it through platform settings?