How do I associate a MailChimp mailing list with a payment page inside Zoho Checkout?

Open the Payment Pages tab and select the page you want to associate with the mailing list.
Click the More Options icon and select Configure MailChimp.

Adding a mailing list image

Choose the mailing list you’d like to configure from the dropdown and click Save. Your payment page will now be associated with that mailing list.

Selecting the desired mailing list image