Hi there,
we've just trying out your extension for joomla and it seems that we found a bug here.
In MailChimp we added a field of type "radio" with is "required".
On the website everything is correct, The field is marked as required and has the correct classes.
But the validation marks the entry with the "validation-passed" class. But the Radio-Button wasn't selected.
Could you check this and give us feedback why this happens?
Greets
Felix