MailChimp’s API uses a POST call request to trigger the custom events. MailChimp does not support JavaScript for implementing their tracking functionality. This contrasts with other email marketing services where it uses JavaScript to trigger the workflows. It can be said that this type of implementation is more complex since there is no script to be added when adding the tracker. Before creating an event, make sure you have added your website to MailChimp.
Adding your website can be done by in the Website page. You can also create your own website with MailChimp for a more seamless integration. It’s worth noting that you’ll have to connect your website first before doing this. Instructions for connecting MailChimp to your website can be found at the references section.