Angular Mailchimp Controller's POST request to Mailchimp API

mailchimp-controller-2.js

// Send subscriber data to MailChimp
MailChimpSubscription.save(
  // Successfully sent data to MailChimp.
  function (response) {
    // Define message containers.
    mailchimp.successMessage = '';
    mailchimp.errorMessage = '';

    // Store the result from MailChimp
    mailchimp.result = response.result;

    // Mailchimp returned an error.
    if (response.result === 'error') {
      if (response.msg) {
        // Remove error numbers, if any.
        var errorMessageParts = response.msg.split(' - ');
        if (errorMessageParts.length > 1)
          errorMessageParts.shift(); // Remove the error number
        mailchimp.errorMessage = errorMessageParts.join(' ');
      } else {
        mailchimp.errorMessage = 'Sorry! An unknown error occured.';
      }
    }
    // MailChimp returns a success.
    else if (response.result === 'success') {
      mailchimp.successMessage = "Thanks for subscribing! Please confirm the email you receive to complete the process.";
    }
  },

  // Error sending data to MailChimp
  function (error) {
    $log.error('MailChimp Error: %o', error);
  }
);