1) Click on the account drop down button in your account's main navigation.
2) Click on the Integrations option.
3) Find MailChimp within the Integration options and click the Install button.
4) Click the Connect to Mailchimp button.
5) You will be directed to a MailChimp hosted page. Enter your MailChimp login credentials and click the Login button.
MailChimp is now available for you to use on your payment forms. Learn how to add your payers to a MailChimp audience list when they check out on one of your payment forms.