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How to use WhatsApp Buissness Calling API?
If you already use WhatsApp for business, you know how powerful it is for customer engagement. People actually read what you send. They reply. They click.
But here’s the problem. When the conversation reaches a point where a voice call makes more sense, you’re stuck. You either ask the customer to dial a number, or you call them and hope they pick up. It breaks the flow.
The WhatsApp Business Calling API fixes that. It lets you add voice calls right inside WhatsApp, so users can go from message to conversation with a single tap.
And with Waca, you don’t just get access to the API, you get the full stack: virtual numbers, AI that handles calls, CRM integration, and setup support from a verified Meta partner.
First things first: what is the WhatsApp Calling API?
It’s part of the WhatsApp Business Platform. Once enabled, it allows your business account to do two key things:
Let users call you from inside WhatsApp
You can add a “Call on WhatsApp” button to any message or template. No phone app. No switching. Just tap to call.Request permission to call your users
If you're initiating the call, you can use a pre-approved message with an “Allow calls” button. Once the user taps it, you're good to go.
This API is ideal for businesses that want to make voice part of their WhatsApp journey — whether that’s answering support queries, following up on leads, or giving real-time consultations.
What do you need to get started?
To use the API, your business must be onboarded to the WhatsApp Business Platform. That involves:
Verifying your Facebook Business account
Creating a WhatsApp Business profile
Registering a phone number
Getting message templates approved
Sounds technical? Don’t worry - Waca handles all of this for you. And if you don’t have a number yet, Waca can also provide a virtual WhatsApp Business number that’s API-ready from day one.
What can you actually build with this?
This is where things get exciting. Once the calling API is enabled, you can build real-time voice journeys inside WhatsApp. Here are just a few things you can do:
Send a product offer with a Call Now button. AI picks up, explains the offer, and asks if the user wants to buy.
Follow up on a lead form by sending a message that says, “Can we call you?” with an Allow Calls button.
Let users escalate a support chat into a call when they want to talk to someone directly.
Add a click-to-call flow to your WhatsApp automation to qualify leads, confirm bookings, or walk through onboarding.
The best part? You don’t need a call center. With Waca’s AI voice, your system can answer instantly, explain clearly, and even close deals, all without involving a human unless it’s really needed.
Why use Waca to set this up?
Here’s what makes Waca more than just a technical integration:
Official Meta partner - No risky workarounds. Everything is compliant and approved.
Virtual WhatsApp numbers - You don’t need to bring your own. Waca can issue numbers ready to go.
AI voice handling - Every missed call or late reply becomes a sales or support opportunity.
Built-in CRM and campaign tools - Your team sees everything, and every interaction is tracked.
Simple onboarding - Waca sets it up. You use it. No dev team needed.
Real use case
A D2C skincare brand ran a WhatsApp campaign offering a 20 percent discount. Instead of sending users to a website, they included a Call Now button. AI picked up, explained the offer, answered questions about the product, and shared a payment link.
They closed 37 percent more sales and cut their lead response time from 4 hours to under 5 minutes. That’s the power of combining WhatsApp Calling with AI.
Final thoughts
The WhatsApp Calling API is not just a new feature it’s a new way to communicate.
It turns WhatsApp from a messaging tool into a conversation engine, where users can move from interest to decision without ever leaving the app.
And when paired with voice AI from Waca, it becomes a channel that works 24/7, scales without headcount, and gives your customers the fast, personal experience they expect.
Want to see it in action? Waca can get you a working number, set up your first campaign, and show you how AI can handle your next 1,000 calls, no pressure, no code.
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