Before you set up the Mailchimp integration in Happy Birthday app, you will need:
a Mailchimp account on the Essentials plan or above, as Automation Flows are not available on Mailchimp's Free plan.
See Mailchimp's comparison page for more details: Compare Mailchimp Marketing plans
Have your Mailchimp account connected to Shopify. See Mailchimp's documentation for more details: Connect or Disconnect Mailchimp for Shopify
Need any help?
Please get in touch with support if you need any further assistance.

