WhatsApp customer service for business, the complete guide

Which WhatsApp to use, the Business app or the official API

Meta has three versions of WhatsApp. The regular one, for personal chats. WhatsApp Business, a free app for small businesses that you download from your phone's app store. And the official API, called the WhatsApp Business Platform, which has no app of its own and runs inside a customer service platform.

Most businesses start with the Business app, and it holds up for a long time. The trouble starts when the number of chats goes past what one person can answer with a phone in hand.

What the Business app already does for free

• Business profile, with address, hours, website and a description of what you do
• Greeting message, sent to anyone who writes for the first time or after a while without talking to you
• Away message, which replies outside the hours you set
• Quick replies, which you call up with a shortcut so you don't type the same thing twenty times
• Labels, to tag each chat by color and find it later
• Catalog, with your services, a photo, a description and the price if you want to show it
• Broadcast list, which sends the same message to many contacts at once and only reaches people who saved your number

If you want to add AI to that app, the two options available today, how to turn each one on and what to write so the AI doesn't make up answers are in How to add AI to WhatsApp Business.

How much WhatsApp for business costs

The WhatsApp Business app is free, and Meta doesn't charge for the messages you send through it. Costs start when your number moves to the official API, and then there are two separate bills.

1. 1Meta's charges. Since July 2025, Meta charges per delivered template message, and the rate depends on the template type and the country. Marketing is the most expensive, and utility and authentication cost less. A regular message answering a client within the 24 hour window is free, and so is a utility template sent within that window
2. 2The platform subscription, which is the software where you and the AI answer clients. Each platform has its own plans, usually based on the number of team members and features

In practice, a business that only answers people who wrote first spends little or nothing with Meta. A business that sends reminders, confirmations and campaigns to a lot of people pays for each of those messages. The rates by country are on Meta's own pricing page, and in some countries the account can be billed in local currency.

What it takes to set up an AI assistant on top of that, counting the platform, the setup and the training, is covered in How much does a WhatsApp AI agent cost. And how far Meta's free AI goes is in Is the WhatsApp Business AI agent free?.

Meta's rules for customer service on WhatsApp

Anyone using the official API agrees to Meta's messaging policies, and app users are bound by them too. Almost every banned number I've seen belonged to a business that didn't know one of these five rules.

1. 1Only message people who gave you their number and agreed to hear from you. Meta calls this opt-in. It can be a checked box on your website form, a written yes in the chat or the person writing to you first
2. 2The 24 hour window. Each message from a client opens 24 hours in which you can reply freely, with text, photos and audio. After that, the API only lets you restart the chat with an approved message template
3. 3Templates approved by Meta. Appointment reminders, payment confirmations and promotions need text that is registered and approved in advance. Each template falls into a category, marketing, utility or authentication, and the category changes the rate
4. 4A way to reach a real person. Automated service has to offer a clear path to a human, either by handing the chat to you or through a phone number or email
5. 5If someone asks you to stop, stop. When a person asks not to get any more messages, inside or outside WhatsApp, you take them off the list right away

On AI, Meta's terms ban using the platform to offer a general purpose AI assistant, the kind of chat that answers anything in the world. An AI that answers questions about your business, books appointments and explains your services is still allowed.

How fast you need to reply

Meta doesn't set a response time. Someone looking for a service on WhatsApp usually sends the same question to more than one business, and books with whoever replies first with an available time. In the accounts I follow, a message left unanswered for more than an hour rarely turns into a client that same day. A study published in Harvard Business Review in 2011, covering about 1.25 million inquiries at 42 US companies, found the same thing. Companies that tried to reply within an hour were nearly seven times as likely to reach a real conversation as those that replied an hour later, and more than 60 times as likely as those that waited 24 hours or more.

Three habits cut your response time without keeping you glued to your phone all day.

• Quick replies for the ten questions you get most, like price, address, insurance, parking and payment methods
• This week's open slots in a ready-made message, which you update every Monday
• A set time to clear the queue, like at the end of each appointment, instead of checking your phone at every notification

The after-hours message

The app's away message replies automatically outside the hours you set. It keeps the person around, as long as it says when you'll be back and what they can send ahead of time. A message that only says "we're closed" sends people off to look somewhere else.

With AI answering, you no longer need the away message. The AI replies at 11 PM the same way it does at 10 AM, shows the open slots and books the appointment. You only step in the next day, on the chats it passed to you.

How to organize chats with labels and a board

A chat that sinks down the list is a client you forget to answer. In the Business app, labels fix that. On a platform, the board with columns does.

The labels that work in the app

The app comes with a few labels, and you can create your own. I keep only a few, and each one says what's left to do with the chat.

• New contact, someone who wrote and hasn't had a full answer yet
• Waiting on reply, when you sent a time or a price and the person went quiet
• Booked, with the date written in the pinned chat
• Payment pending, for people who booked and haven't paid the deposit
• Served, so you can send the review request and the follow-up at the right time

Every morning, open the "Waiting on reply" label and send a short message to anyone who went quiet more than a day ago. It's the part of customer service that brings the most clients back and the one most businesses skip.

The conversation board, on a platform

In the setups I build, each chat becomes a card on a board with columns, running from first contact to payment and follow-up. The AI moves the card on its own as the chat moves forward, and you open the board to see how many people came in today, how many booked, how many paid and who needs you.

When to move from the app to the official API

The Business app works very well up to a point. These are the signs you've passed that point.

• More than one person needs to answer the same number at the same time
• You lose chats because they slid down the list and nobody saw them
• Messages come in at night and on weekends, and you want them answered right away without being on call
• You want to send reminders and confirmations automatically for every booking
• You want the numbers, how many people wrote, how many booked and how many paid
• Your customer service needs to talk to another system, like your calendar, payments or client records

How the move happens

1. 1You pick the platform and create your business account in Meta's business manager
2. 2The number is connected to the API and goes through Meta's verification, along with the display name
3. 3The message templates, like reminders and confirmations, are written and sent for approval
4. 4The service is set up on the platform, with the columns, the replies and the AI
5. 5You test it from another number before opening it to clients

You can keep the number you already use. Since 2025 Meta has offered a way to keep the Business app and the API on the same number, called coexistence, but it depends on the platform supporting it and it turns off some app features, like broadcast lists. Before switching, ask whoever sets it up what happens to your number and your chat history.

What AI does in customer service, and what it doesn't

My own WhatsApp is answered by an AI called Marina. It replies to everyone who writes in, asks what they're looking for, explains how I work and hands me the chat when the person wants to talk to me. Building Marina, and then the assistants for my clients, is how I learned where AI helps and where it gets in the way.

With Marina, I set two rules that apply to any AI assistant. Two questions per message at most, because five questions in a row feel like a form. If the person doesn't answer the same question twice, the chat comes to me, instead of the AI repeating itself.

AI also needs upkeep. Every week a new question comes in that it didn't know how to answer, and that question goes into its training. If nobody reads the chats, within a month it's getting the new questions wrong.

The risk of getting your number banned

A ban is the worst thing that can happen to your customer service, because every contact and chat goes with the number. These are the causes I see most.

• Software that imitates WhatsApp Web to mass send messages or run a bot outside the official API. Meta detects it and bans the number
• Messaging a purchased list or people who never gave you their number
• Lots of reports and blocks from people who got messages they didn't ask for
• Mass sending from a new number, which has no chat history yet
• Messages that look like a scam, with shortened links and requests for personal data

On the official API, Meta gives each number a quality rating and limits how many people you can reach with templates per day. When a lot of people block or report you, the rating drops and the platform shows a warning before any restriction. That's when you stop the campaign and rewrite the message.

Does WhatsApp Business have a support phone number?

No. WhatsApp doesn't offer support by phone, toll-free or otherwise. Official support is inside the app, under Settings, Help, Contact us, and through the contact form on the WhatsApp website. Any phone number presented as WhatsApp support is a scam, and the call ends with a request for your verification code, which hands your account to the scammer.

The mistakes I see most

• Answering only when you get a chance. The person already sent the same question to three other places
• An away message that doesn't say when you'll be back
• No labels at all, so the chat from someone asking for a booking gets buried under twenty others
• Sending the price and asking nothing else. A price with no question after it ends the chat
• Never following up with people who went quiet
• Using your personal WhatsApp for the business, mixing family, clients and suppliers in one place
• Turning on AI without telling it what it can't answer

Where to start

WhatsApp is the last stretch of the path. Before it comes Google, where people find you, and your website, where they decide to reach out. If those pieces aren't in place yet, start with How to show up on Google and What a professional website needs. If you don't know which piece to fix first, my services cover the whole path.