Klaviyo WhatsApp Integration: Step-by-Step Setup Guide

WhatsApp has officially arrived in Klaviyo. For brands, this is not just another channel — it’s a chance to meet customers where they already spend their time. With over 2.7 billion monthly active users globally (Statista, 2025), WhatsApp is becoming one of the most direct and profitable ways to engage shoppers.

At my agency, we’ve already seen clients adopt WhatsApp inside Klaviyo to complement their email programs. If you haven’t tried it yet — you’re already behind. The good news? Setting it up is easier than you might think.

Why Klaviyo WhatsApp Matters

Klaviyo is positioning WhatsApp not just as a messaging add-on, but as a revenue channel. Unlike SMS, WhatsApp allows for branded conversations, rich media, and persistent engagement. According to Klaviyo’s announcement, early adopters have already reported higher click-through rates than with SMS.

If you missed it, I’ve already shared how WhatsApp can turn messaging into revenue — check out that article here.

Now let’s dive into how to actually integrate it.

Step 1: Connect Your WhatsApp Business Account

To start, you need a verified WhatsApp Business Account (WABA).

1. Go to Klaviyo Integrations → WhatsApp.
2. Follow the prompts to connect your WABA through Meta.
3. Verify your business details (this may require Facebook Business verification)

Step 2: Add and Verify Your Phone Number

• Register your sending phone number inside Klaviyo.
• Meta will send a code to verify ownership.
• Once approved, this number becomes your brand’s sender ID for all WhatsApp campaigns.

Step 3: Upload or Sync Contacts

Klaviyo allows you to sync existing lists or segments. Best practice:

• Use a consent-based segment (customers who opted in to WhatsApp).
• Start small: abandoned cart shoppers, VIP customers, loyalty members.

Step 4: Set Up Message Templates

WhatsApp requires pre-approved templates for outbound messaging. Inside Klaviyo:

• Go to Messaging → Templates.
• Create templates (welcome, abandoned cart, order confirmation).
• Submit them for approval through Meta (this can take 24–48 hours).

Step 5: Build Automated Flows

Once templates are approved, you can add WhatsApp steps to your flows. Popular use cases:

• Abandoned Cart → WhatsApp reminder 1 hour after email.
• Back in Stock → instant WhatsApp alert.
• Order Confirmation → WhatsApp receipt + shipping updates.

The magic happens when you combine WhatsApp with email. For example, send a long-form product education email, then follow up with a WhatsApp message that drives them back to checkout.

Step 6: Test Before You Launch

Before going live:

• Test your flows with internal numbers.
• Check template rendering (emojis, images, links).
• Ensure the opt-out is clear and easy (Klaviyo handles this automatically).

Compliance and Best Practices

WhatsApp is powerful, but it comes with strict compliance rules.

• Customers must opt in before receiving promotional messages.
• Avoid spammy frequency — once a day max for promos is safe.
• Use WhatsApp for timely, personal, and high-value communication.

Resource: Meta WhatsApp Business Policy

What to Do After Integration

• Monitor analytics: Klaviyo now shows delivery, clicks, conversions for WhatsApp.
• A/B test templates just like you do with emails.
• Consider flows you already run in email and decide which deserve a WhatsApp touchpoint.

Ready to Launch WhatsApp in Klaviyo?

Our clients are already using WhatsApp to boost revenue, recover carts, and build stronger customer relationships. Don’t wait until your competitors get two steps ahead.

Get a free Klaviyo WhatsApp audit — we’ll review your account, map your first flows, and show you where revenue opportunities are hiding.