MailChimp lets users design, send, and track email campaigns. A popular email marketing service, the Choreos for the MailChimp API allow easy access to list data, campaign data, and more.
To use the Choreos in this bundle you'll need a MailChimp API Key, which is used to authenticate your account. If you already have a MailChimp account, you can find both keys by logging into your account and going to Account menu. Under Extras, you should see "API Keys and Authorized Keys". If you don't have an MailChimp account, you can sign up for one at http://mailchimp.com/signup/.