Clava provides integrations with several email providers including: Mail Chimp, Brevo & Send Grid.
Navigation: Settings > Integrations > Marketing
Process
Select the email provider to Enable
Add your Mailchimp API Key and choose your Audience or List ID
Where do I find my Mailchimp API key?
Login to Mailchimp.
Click your profile name to expand the Account Panel and choose Account Settings.
Click the Extras menu and choose API keys.
Copy an existing API key or click the Create A Key button