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As of release 4.1 which just went out today, we’ve added a filter for anyone wanting to alter the cookie settings. Here’s an example of how to do this – just by adding this snippet to your functions.php file.
add_filter('mailchimp_cookie_data', function($data) {
$data['options']['httponly'] = true;
return $data;
});The filter is provided with a name of the cookie and the options are the options needs to be returned to the setcookie function. For this example, it will set the httponly to true as you needed. Hope this helps!