Decline to Consent Warning

You kinda already have this functionality built in by having the pop up that requests a reason for declining or opting out, before they are able to do so. Are you wanting another step beyond that? As for being able to email particular signers or others when someone opts out of a transaction, you could create a listener and sign up for callbacks and notify who you need to notify when you get a notification that someone has opted out. https://developer.esignlive.com/guides/feature-guides/callback-notifications/ Let me know.