Vesteo Business Theme could be integrated with MailChimp. To do that you need to generate an API key and to create at least one list. More information could be found HERE and HERE.
Step 1: Navigate to “Appearance - Customize” and click on “Vesteo Integrations”
Step 2: Enter the API key in the “MailChimp API key” field
Step 3: Enter the list ID in the “MailChimp list ID” field
Step 4: Click on “Save & Publish”