Mailchimp API failed calls

Since converting my registration form to GravityForms, I integrated my Mailchimp signup into it as well. However, if I log into my mailchimp account and look at the historical API call by day (under Account->API Keys) I see that I have a high number of "failed calls" ~70%. What does gravity forms do when an API call fails? Is there some sort of log that I can look at to troubleshoot my settings? Is there a hook that I tie into so I can have it email me whenever their is a failed call?

Mailchimp just says whether the result was a success or not...they rely on the application to get a return value and then make a determination as to the problem. It would be great if they allowed you to troubleshoot from the website.

However, I think I figured out what is going on. I spoke with customer support at Mailchimp a couple of days ago and they told me that any failed API calls are the result of problems with the request (bad formatting, improper call, etc.) If someone is already subscribed, it won't fail. After playing around with this, I think that is incorrect...I believe it will actually fail if there is a problem.

In the meantime, I've added the following code to the export_feed method to have a note added to the entries that are involved with Mailchimp in order to get an idea of what is happening with the various entries (borrowed from the paypal plugin):

if($current_user && $user_data = get_userdata($current_user->ID)){
            $user_id = $current_user->ID;
            $user_name = $user_data->display_name;
        }
RGFormsModel::add_note($entry["id"], $user_id, $user_name, sprintf(__("Status for subscription: %s", "gravityforms"), $retval));

Will let you know if this truly is a problem

So far it's worked well. It at least gives me an avenue to do some troubleshooting.