The easiest way to migrate contact information to Mailchimp is using the ‘Contact Collection’ widget. This widget is customizable with several integration options, including Klaviyo. Create a unique ‘API Key’ on Klaviyo and add it to the Klaviyo integration when you select it on the mobile-optimized landing page editor. From there, you can control which lists or audiences new subscribers will automatically be added to via Klaviyo.