I just downloaded the MailChimp integration plugin. I installed it and added my API key. When I open my quiz and try to edit the MailChimp settings, I see this error at the top of the tab:
Warning: http_build_query(): Parameter 1 expected to be Array or Object. Incorrect value given in /home4/health/healthfitcorpwell.com/www/wp-includes/Requests/Transport/cURL.php on line 507
Additionally, I can't select the subscriber list I want to add my quiz users to, it only gives me a few options, not all of my lists are displayed.