Click on your name from the top menu. After that, click on the account menu item.
Navigate to the API keys page.
Copy your API key.
Get back to your integration page and click on the “New Integration” button. A modal will popup. You have to select MailChimp as your service, give a name for your integration, and paste your API key. Check the screenshot given below:
Now, get back to MailChimp and click on the audience from the top menu.
Click on the “view contacts” button from the audience page.
Then navigate to the “audience name and defaults” page by clicking the settings sub-menu.
Copy your audience list ID.
Move back to the “RetargetKit integration” page and paste your audience list ID. Optionally, you can provide a tag name to segment your subscribers. After that, press the save button.
Now, it’s time to enable MailChimp syncing. Navigate to Leads page by click Leads from the top menu.
Click on the sync icon.
Select your MailChimp integration and Enable syncing. That’s it.