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To make this component work you will need to download the Mailchimp API wrapper class (MCAPI.class.php file), and place it in app/vendors. You can download the wrapper class here: http://www.mailchimp.com/api/downloads/

I'm using version 1.2.1 of the MCAPI wrapper class.

I've also placed my Mailchimp API key in a mail_chimp.php file in the config directory.

Here's what that config file looks like:

Download code
<?php
/**
 * MailChimp api key
 */
$config['MailChimp'] = array('apiKey' => 'YOUR API KEY GOES HERE');
?>

Here is my component class. It uses the magical __call method to wrap the Mailchimp API wrapper.

Component Class:

Download code <?php 
class MailChimpComponent extends Object
{
    /**
     * The MailChimp API wrapper.
     */
    var $mcapi = null;

    /**
     * Creates an instance of the MailChimp API wrapper class.
     */
    function __construct()
    {
    App::import('Vendor', 'MCAPI', array('file' => 'MCAPI.class.php'));
    $this->mcapi = new MCAPI($this->getApikey());
    }

    /**
     * Get the MailChimp apikey.
     */
    function getApikey()
    {
    Configure::load('mail_chimp');
    return Configure::read('MailChimp.apiKey');
    }

    /**
     * Pass the called function directly to the MailChimp API.
     */
    function __call($method, $args)
    {
    if (!empty($this->mcapi) && method_exists($this->mcapi, $method)) {
        $caller = array($this->mcapi, $method);
        return call_user_func_array($caller, $args);
    }
    return null;
    }

    /**
     * Returns the last error code from MailChimp.
     */
    function errorCode()
    {
    if (!empty($this->mcapi)) {
        return $this->mcapi->errorCode;
    }
    return null;
    }

    /**
     * Returns the last error message from MailChimp.
     */
    function errorMessage()
    {
    if (!empty($this->mcapi)) {
        return $this->mcapi->errorMessage;
    }
    return null;
    }
}
?>
Here's how you might use this in a controller.

Controller Class:

Download code <?php 
class MailingListController extends AppController
{
  var $uses = array();
  var $components = array('MailChimp');  

  function showLists()
  {
    $lists = $this->MailChimp->lists();
    $this->set('lists', $lists);
  }
}
?>