Install the Klaviyo for Buy with Prime app from the marketplace in the merchant console. To connect your Klaviyo account to Buy with Prime, sign in to your Klaviyo account and copy the API key provided by Klaviyo. Paste the email used for your Klaviyo account and API key into the Klaviyo app. Then sign in to Klaviyo.com again and start the new objective called “Set up abandoned checkout flow on Buy with Prime."