I am afraid I do not know about the API but for info see attached my simple signup form for Mailchimp (remove the .txt)
You will need to create three variables in SD:
Code:
<actinic:variable name='MailChimpListManageURL' /> eg: eg: https://yourdomain.us3.list-manage.com
<actinic:variable name='MailChimpLongNumber' /> The long number generated when you create a form in Mailchimp
<actinic:variable name='MailChimpID' /> The Mailchimp ID generated when you create a form in Mailchimp
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