ARForms – Mailchimp Advanced Integration Addon
This ARForms addon allows you to send additional field’s data to Mailchimp other than just basic fields. With this addon, you can map additional fields with Mailchimp field and it will send all mapped field’s values to Mailchimp after form submission of ARForms.
After verifying successfully, you will have all subscriber list loaded at List ID. Select your subscriber list at there and save your configuration changes.
Advanced Mailchimp Option