Published on October 29, 2026 · The mitza.es team
Many businesses already serve their customers on WhatsApp, but there comes a point when the company phone can't do any more: several people need to reply from the same number, messages get lost outside business hours or you want to connect WhatsApp to your store or your CRM. That's where the WhatsApp Business API (technically, the WhatsApp Business Platform) comes in, and with it, chatbots. This guide explains what it is, how it differs from the free app, how it's charged and when it pays off to make the jump.
The pricing and policy information comes from Meta's documentation as consulted in October 2026 and changes frequently: check it in the official documentation or with your provider before deciding.
WhatsApp Business app vs the API: the difference
- The WhatsApp Business app is free and designed so that one person can serve customers manually from a phone (or a linked computer): business profile, catalog, labels and quick replies. Its broadcast lists have a recipient limit (around 256) and it doesn't integrate with other tools.
- The API (WhatsApp Business Platform) is designed for companies that want to automate and scale: several agents in a shared inbox, chatbots, sending approved message templates, campaigns and connections to a CRM, an online store or in-house systems. It's used through a provider or with your own development, and you pay per use.
Both reach the same WhatsApp network: what changes is the capability. For a hair salon with a single person answering, the app is enough; for a business with a high volume of inquiries and several people, the API is the reasonable choice.
What a BSP is and how you sign up for the API
A BSP (Business Solution Provider) is a provider authorized by Meta that offers a platform for using the API: inbox, chatbot builder, integrations and billing. It's also possible to connect directly to Meta's Cloud API with your own development. The usual choice for a small business is a provider, because it supplies the interface and the support. To get started you need a phone number for the API (the usual approach is to dedicate one, although some providers allow it to coexist with the WhatsApp Business app) and a Meta Business account, normally with the company verified.
What it costs: how Meta charges for messages
Since July 1, 2025, Meta charges per delivered message rather than per 24-hour conversation. The rate depends on the message category and the recipient's country. According to its documentation, the categories are marketing, utility and authentication (template messages) and service (free-form replies to a customer who has written in). Some key points:
- Only messages from the business to the customer are charged, and only when they are delivered.
- If the customer starts the conversation from a Click to WhatsApp ad, for a window of up to 7 days the business's replies are free.
- Each phone number gets 1,000 free service messages per month, and, according to Meta, from October 1, 2026 it starts charging for service messages above that cap and for utility messages sent within an open conversation.
- Utility and authentication messages have pricing by volume tiers, which reset every month.
On top of this comes whatever the provider charges (subscription, per agent or per number). We don't give figures because rates vary by country, category and provider and are updated; always ask for the full breakdown and calculate the estimated cost with your real monthly messages.
What a chatbot can do on WhatsApp (and what it can't)
A well-designed chatbot handles the repetitive tasks and leaves people with what requires judgment:
- Answer opening hours, location, availability and frequently asked questions at any time of day.
- Look up the catalog, report the status of an order or remind someone of an appointment.
- Collect customer details (name, need, urgency) before passing them to a person.
- Hand the conversation over to an agent when the customer asks or the bot can't solve it.
What it must not do is pretend to be a person or trap the customer with no way out. Since August 2026, the European AI Act requires telling people when they are talking to an automated system (we explain it in our article on AI Act transparency). In addition, since January 15, 2026 Meta has restricted general-purpose AI chatbots on the WhatsApp Business API, while it allows a company's own assistants for customer service, bookings, order tracking, notifications or sales.
When it pays off to move to the API
It usually pays off if you recognize yourself in several of these situations:
- More than one person needs to reply from the same number.
- You receive a volume of inquiries you can't handle outside business hours.
- You want to send order notifications, appointments or reminders automatically.
- You need to connect WhatsApp to your store, your CRM or your calendar.
- You want to measure how many conversations turn into leads or sales.
And it doesn't pay off if you only get a handful of messages a day, if the value lies in the personal touch or if you haven't yet defined what you want to automate. In that case, start with the app and with the WhatsApp link with an opening message or a QR code that leads to the chat.
How to get started without complications
- Define the goal: which tasks you want off your plate (opening hours, orders, appointments) and which ones stay human.
- Write the script: the ten most frequent questions and their answers, in your brand's tone.
- Choose a provider by comparing price per message, support in Spanish, integrations and exit terms.
- Prepare the number for the API and verify the company with Meta.
- Prepare the message templates you'll need (notifications, confirmations) and submit them for approval.
- Set up the handover to a person and the service hours.
- Measure: messages sent, resolved by the bot, handed over and cost per conversation, and adjust.
Common mistakes
- Sending marketing messages to people who haven't given their consent: besides being bad practice, WhatsApp can limit your number.
- Automating everything so that the customer can't find a way to talk to a person.
- Not identifying the assistant as an automated system.
- Choosing a provider only by the subscription price, without looking at the cost per message.
- Forgetting to measure: without data you can't tell whether the bot saves time or just annoys people.
Measure what it brings in: tags and analytics
If you advertise your WhatsApp on your website, in ads or in emails, it pays to know which link brings in each conversation. You can tag your links with our UTM builder and measure the results with web analytics. And for the context of what Meta has changed this year, read our article on WhatsApp Business with AI: what changes for your small business.
How we can help at Mitza
We set up AI assistants on WhatsApp Business that handle repetitive inquiries, meet the obligation to identify themselves as an automated system and hand over to a person whatever truly needs one. See our WhatsApp Business AI automation service or tell us about your case on the contact page.