As of August 8th 2018, Klaviyo Integrations (both Step 1 and Step 3) now preserve the double opt-in options as they are set within your Klaviyo account list and segment settings. A custom form integration within Justuno is no longer required for the double opt-in functionality.
Under "Private Keys", click "Create API key" on the top right.
Copy your "API Key". NOTE: Users who are integrating through the design canvas to collect more information from customers, STOP HERE. There is no need to also integrate Klaviyo in the integrations section. Head here to more instructions.
Log in and click "Promotions" and then select "Edit Integrations" next to the desired Promotion
On the "App Integration" tab, locate and click on the Klaviyo "Connect" button to launch the configuration options. a. Enter your API Key b. Select a Klaviyo campaign and click "Save.
Your Justuno will now sync new signups to your selected Klaviyo list as they come in!
Important Step: If you have an integration set up in Step 3 of your promotion already, please disconnect it in order for the step 1 integration to work.