Whatsable
There is no native WhatsAble app in Klaviyo. A Klaviyo flow can send a webhook. Zapier, Make, or n8n catch that webhook and send WhatsApp with WhatsAble.
Copy your WhatsAble API key before you connect Zapier, Make, or n8n.
Do not paste a WhatsAble incoming webhook URL into Klaviyo. That URL is for WhatsAble to call your system. It is not for Klaviyo to start a send.
A flow webhook is one-way. It does not sync WhatsApp back into Klaviyo. Leave the WhatsApp Business app on the number.
What can I build from a Klaviyo flow?
An abandoned-cart WhatsApp that starts in Klaviyo. The flow already decided who should hear from you. The webhook hands the phone to Zapier, Make, or n8n, and WhatsAble sends the message. You keep the profile in Klaviyo. This page does not invent Klaviyo variable names.
A Sheet of sends. The same scenario can append a row after WhatsAble sends, so you can see volume later. No invented Sheet buttons.
A CRM that knows WhatsApp went out. After the send, the same Zapier, Make, or n8n scenario can mark the contact in the CRM you already use. This page does not invent CRM clicks.
Webhook
Mint the catch URL in Zapier, Make, or n8n first. Then paste it into the Klaviyo webhook destination.
Official Klaviyo steps:
1. Open a flow.
2. Drag Webhook from the left sidebar, or + on a node.
3. Set an HTTPS destination to the Zapier, Make, or n8n catch URL you already minted. No self-signed certificate. No redirect.
4. Add headers if you need them.
5. Put a JSON body. Include a phone number you already have on the Klaviyo profile. This page does not invent a variable name.
6. Save.
You need Manager, Admin, or Owner, and two-step authentication.
https://developers.klaviyo.com/en/docs/how_to_add_a_webhook_action_to_a_flow
https://help.klaviyo.com/hc/en-us/articles/4534329515931
Zapier
Mint a Zapier catch URL first. Copy it. Paste it into the Klaviyo webhook destination. Then send with WhatsAble.
Action: Send WhatsApp Message.
Phone: digits only. No +.
Paste your WhatsAble API key.
https://whatsable.app/integrations/zapier
Make
Mint a Make catch URL first. Copy it. Paste it into the Klaviyo webhook destination. Then send with WhatsAble.
Action: Send WhatsApp Message.
Phone: digits only. No +.
Paste your WhatsAble API key.
https://whatsable.app/integrations/make
n8n
Mint an n8n catch URL first. Copy it. Paste it into the Klaviyo webhook destination. Then send with WhatsAble.
Action: Send template via Notifyer. Phone: + is allowed. Non-template via Notifyer is the other n8n action if you are already in a conversation. This page does not treat that as a WhatsAble 24-hour product.
Paste your WhatsAble API key.
https://whatsable.app/integrations/n8n
What this is not
This is not a native WhatsAble app in Klaviyo, and it is not two-way sync from a flow webhook. It is not a price, and it is not a vibe-code install inside Klaviyo.
Compare WhatsAble and Klaviyo WhatsApp: https://whatsable.app/compare/whatsable-vs-klaviyo.
Sources
https://developers.klaviyo.com/en/docs/how_to_add_a_webhook_action_to_a_flow
https://help.klaviyo.com/hc/en-us/articles/4534329515931
https://whatsable.app/integrations/zapier