Send an email to your Klaviyo contacts who have not yet subscribed to your WhatsApp channel.
Klaviyo:
- Go to Audience > Lists & Segments
- Create List / Segment
- Select Segment
- Give your Segment a name
- Under Definition, select Properties about someone
- The Dimension should be charles_opt_in_status is not set:

- Select Create Segment
- Then, use this list to send a Campaign encouraging these contacts to opt-in for WhatsApp. We recommend incentivizing with a special deal or discount