WhatsApp AI Chatbot for Business: Rules, Costs and Setup

If your customers live on WhatsApp, your sales do too. The question is no longer whether to answer on WhatsApp. It's how to answer fast enough, every time, without hiring a team to sit on their phones all day.

That's what a WhatsApp AI chatbot does. Done right, it answers in seconds, asks the questions your best salesperson would ask, sends the payment link and hands the chat to a person when it should. Done wrong, it gets your number restricted.

This guide explains how WhatsApp AI chatbots actually work, the rules Meta sets, and what you need to prepare. Replyvoo's WhatsApp AI chatbot is coming soon, and everything here applies whichever tool you choose.

What a WhatsApp AI chatbot is (and is not)

Old WhatsApp bots were menus: "Reply 1 for prices, 2 for delivery." Customers hated them because real people don't talk in numbers.

An AI chatbot reads the message the way a person would. "Do you deliver to Westlands and how much is the blue one?" is two questions, and a good AI agent answers both from your price list and delivery rules. It can also:

• Understand voice notes and casual spelling
• Ask qualifying questions (budget, timing, size, location)
• Send a payment, booking or checkout link
• Recognise a complaint or a refund request and pass it to a human
• Reply in the customer's language

What it is not: a general chatbot that will happily chat about the weather, write essays or answer anything at all. That distinction matters on WhatsApp more than anywhere else, as you'll see below.

The only safe way in: the WhatsApp Business Platform

There are three ways businesses use WhatsApp:

1. The WhatsApp Business app. Free, on your phone, with quick replies and an away message. Great for one person. No real automation.
2. Unofficial tools that log in to WhatsApp Web or pretend to be a phone. Cheap, and against WhatsApp's terms. Numbers get banned, often without warning, and you lose your contacts and chat history with them.
3. The WhatsApp Business Platform, Meta's official API (most businesses use the Cloud API version hosted by Meta). This is the only route built for automation at scale.

Any WhatsApp AI chatbot worth trusting connects through option 3. If a tool asks you to scan a QR code with your phone to "connect your WhatsApp bot", walk away.

What you need to connect

• A Meta Business portfolio (formerly Business Manager) for your company
• A phone number registered on the platform. You can use a new number or move an existing one; Meta's current options also let some businesses keep using the WhatsApp Business app alongside the API on the same number
• A display name that Meta approves (use your real brand name)
• Business verification, which raises your messaging limits and builds trust

Most platforms, including Replyvoo, use Meta's Embedded Signup: you log in with Facebook from the dashboard, pick or create your WhatsApp Business Account and register the number in a few screens. No developer needed.

The 24-hour customer service window

This is the single most important rule to understand.

When a customer sends you a message, a 24-hour customer service window opens. Inside that window, your business can reply freely: any text, links, images, as many messages as the conversation needs. Every new message from the customer resets the 24 hours.

Once the window closes, you can't just send a normal message. You can only send a template message: a pre-written message you submitted to Meta and Meta approved.

Why this matters for AI:

• Speed wins inside the window. A lead who messages at 9 p.m. and gets an answer at 9 a.m. the next day is still inside the window, but they've likely bought elsewhere. An AI agent answers in seconds, while they're still holding the phone.
• Follow-ups need planning. If someone asks for the price and goes quiet, a reminder a few hours later is easy. A reminder three days later needs an approved template.

Template messages and what they cost

Templates come in categories, mainly marketing, utility (like order or appointment updates) and authentication (one-time codes). Meta reviews each template before you can use it.

Meta charges for template messages. Pricing is per message, and it depends on the template category and the country of the person you're messaging. Replies inside the 24-hour window are not charged the same way. Because Meta changes prices from time to time, always check Meta's current rate card rather than a number you read in a blog post (including this one).

A good AI chatbot setup keeps most of the selling inside the free-flowing window and uses templates only for things customers actually want: order confirmations, delivery updates, appointment reminders.

Opt-in: ask before you message first

You may only start a conversation with someone who has agreed to hear from your business on WhatsApp. That consent is called opt-in. It can come from a checkbox at checkout, a form, a message the customer sends you, or a clear request in another channel.

Practical rules of thumb:

• Make it clear what they're opting in to ("order updates and occasional offers on WhatsApp")
• Keep a record of when and how they opted in
• Make stopping easy, and respect it immediately

Ignore opt-in and people block or report your number. Enough blocks and Meta lowers your quality rating, which can limit how many people you can message.

Meta's current rules on AI chatbots

In 2026, Meta's WhatsApp Business terms draw a clear line:

• Allowed: automation that serves a business's own customers. Answering product questions, taking orders, booking appointments, sending updates and handling support are all fine.
• Not allowed: general-purpose AI assistants offered through WhatsApp, where the AI itself is the product.

Under Meta's current rules, a sales and support agent for your shop is on the right side of that line. A bot that answers anything about anything is not.

This is exactly how Replyvoo's Closers are built. Each Closer only answers from your business knowledge (products, prices, policies, FAQ), stays on topic and hands anything else to a human. Policies change, so we re-check Meta's rules before launch and whenever they're updated, and you should do the same with any vendor.

What a good WhatsApp AI conversation looks like

Here's an example for a real estate agency (names and prices are made up):

• Customer: Hello, is the 2-bedroom in Westlands still available?
• AI agent: Hi Sofia! Yes, it's available from 1 November. Rent is $950 a month. Are you looking to move this month or next?
• Customer: Next month. Can I see it this weekend?
• AI agent: Of course. Saturday 10:00 or 14:00 works for our agent. Which do you prefer?

Notice what happened: the agent answered the question, asked one qualifying question, then moved straight to the next step (a viewing). No menus, no "an agent will contact you". By the time a human agent sees this lead, it's qualified and booked.

Setting up a WhatsApp AI chatbot: a checklist

1. Start Meta business verification early. It can take days or longer, and it gates higher limits.
2. Decide which number to use. A dedicated business number is simplest.
3. Write your knowledge base. Prices, delivery areas and fees, opening hours, refund policy, the ten questions you answer every day. Our guide to writing a knowledge base your Closer can use walks through it.
4. Define handoff rules. Complaints, refunds, large orders and anything sensitive should go to a person, with the full chat history.
5. Write two or three templates for follow-ups customers want, such as order confirmed, out for delivery and appointment tomorrow.
6. Collect opt-in properly at checkout and in your forms.
7. Test with your own phone before you put the number on ads.
8. Watch the first week closely and fix any answer the AI got wrong. A good platform remembers the fix.

Common mistakes to avoid

• Using unofficial "WhatsApp API" tools. Cheap until your number is banned.
• Blasting everyone in your contacts. No opt-in means blocks, reports and a falling quality rating.
• Letting the bot go off-topic. It hurts customer trust and conflicts with Meta's current rules.
• No human escape hatch. People must be able to reach a person. Always.
• Forgetting the window. Plan follow-ups so the important ones happen while the 24 hours are still open.

Where Replyvoo fits

Replyvoo is an AI sales and support platform for chat apps. Closers are live on Telegram today, and WhatsApp is coming soon through the official WhatsApp Business Platform. It needs Meta's approval, so we don't promise dates.

You can join the WhatsApp waitlist, or build your Closer now on Telegram. Your knowledge base, tone and handoff rules carry over, so the same Closer can answer WhatsApp the day it opens. Plans are priced per conversation, not per message; see pricing. Meta's own fees for template messages are separate and charged at Meta's rates.

If you're weighing up where to sell first, read our honest comparison of Telegram vs WhatsApp for selling.