WhatsApp Business API for UK businesses: what it costs and how to get approved

The WhatsApp Business API lets you message customers from your own systems, in your business’s name, at a volume the app can’t handle. Confirmations, reminders and replies go out automatically, and your team answers from a shared inbox rather than one phone. For UK numbers, Meta charges £0.0458 per marketing message and £0.0159 per utility, authentication or service message, on its October 2026 rate card.

Getting approved is mostly admin: a Meta business portfolio, business verification, a phone number, a display name and approved message templates. After that, three rules shape what you can send: the 24-hour reply window, opt-in and your quality rating. This guide covers each one, what a provider adds to the bill, and the order to do things in.

When have you outgrown the WhatsApp Business app?

The WhatsApp Business app is built with the small business owner in mind. It’s for one-to-one chats from a phone, and the messages you send from it are free. It stops working when one of these is true:

• You want your booking, ordering or customer system to send messages by itself.
• More than a few people need to answer the same number.
• You want an AI agent or an automation to handle the first reply.
• You need delivery and read reports you can act on.

That’s the WhatsApp Business Platform, usually called the API. Its Cloud API lets software send and receive WhatsApp messages, with Meta hosting the infrastructure. Nobody taps through an app. Your systems, or a provider’s inbox, do the sending.

You don’t always have to give the app up. Through a partner, Meta lets you connect an existing Business app number to the Cloud API and keep using the app for one-to-one chats. Messages from the app stay free, and messages through the API are charged. The trade-offs: broadcast lists in the app are switched off, and the number is capped at 20 messages a second.

Should you go direct to the Cloud API or use a provider?

Everyone ends up on Meta’s Cloud API. The question is who sits between you and it.

• Direct. Your developers connect to the Cloud API themselves. Meta bills you for messages, and you build or buy the inbox, automations and reporting.
• Through a provider. Meta calls them Solution Partners and Tech Providers, and most people say BSP, short for Business Solution Provider. They onboard you and usually supply an inbox, template tools and integrations. Solution Partners can invoice you for Meta’s message fees directly.

Picking a provider is becoming less of a one-way door. Meta is splitting the old WhatsApp Business account in two. Your phone number sits in a WhatsApp account you own, while templates and billing sit in a Messaging account. Meta says this lets you add or change partners without migrating your number.

What do you need to sign up?

Four things, set up in this order.

A Meta business portfolio

Setting up the Cloud API starts with choosing or creating a business portfolio. That’s the account in Meta Business Suite that owns your WhatsApp assets. Use your company’s legal name and details, because verification checks them.

Business verification

Verification proves to Meta that your company is real. You can start messaging before it’s done, but only within a low daily limit. Verifying is one way to raise that limit to 2,000 customers a day. Some approved Solution Partners can submit verification on your behalf, and Meta says those decisions take minutes instead of days. In our experience, an established brand with a website and a track record is set up in under 24 hours. A newer business with no website or history can take about two weeks.

A phone number

The number must be owned by you, and Meta confirms it with a code by text or voice call. A number already on WhatsApp can’t be registered until that account is deleted, unless you use the Business app connection above. The number still works for normal calls and texts. New business portfolios can register two numbers to begin with.

A display name

This is the business name customers see on your profile. You set it when you register the number, and Meta reviews it against its naming guidelines once you reach a higher messaging limit. Keep it close to your real trading name. You can change it up to 10 times in 30 days, but each change is reviewed again.

How do message templates work?

If a customer hasn’t messaged you in the last 24 hours, you can only reach them with a template. A template is a pre-approved message with gaps for names, dates or order numbers. Each one has one of three categories, and the category sets the price.

Watch the edges, because they move your bill. Meta treats an order update with a promotion in it as marketing. A template with unclear content counts as marketing too. Basket and renewal reminders are marketing even when the customer asked for them. Meta also re-checks approved templates and can move them to a different category, with notice by email and webhook.

How approval works

You submit each template with sample values for its gaps. Meta checks it with automated systems and human review, and a decision can take up to 24 hours. Common rejections include:

• badly formatted or out-of-order variables
• a duplicate of a template you already have
• asking for sensitive details, such as a full card number
• threatening language, such as warning a customer of legal action

A rejected template can be edited and resubmitted, or appealed, with a decision on the appeal within 24 hours. Write and submit templates early, because nothing outbound goes until they’re approved.

What is the 24-hour customer service window?

When a customer messages or calls you, a 24-hour customer service window opens. Each new message from them resets the timer. While it’s open, you can reply with anything: text, images, documents. Once it closes, you’re back to templates.

Replies inside the window aren’t free any more. From 1 October 2026, Meta charges for service messages after the first 1,000 each month on each number. In the UK, that’s £0.0159 a message. Utility templates sent inside the window are charged again too.

There’s one free route. Someone might message you from a Click to WhatsApp ad. If you reply in the window, Meta doesn’t charge for your messages for up to 7 days. Meta’s own AI agent is the exception, and stays charged.

What are the opt-in rules?

You can only message people who gave you their number and agreed to hear from your business. Meta’s requirements are short:

• Say clearly that they’re opting in to messages from you.
• Name the business they’ll hear from.
• Follow the law that applies to you.

Meta says the opt-in doesn’t have to mention WhatsApp, as long as you comply with local law. In the UK, the law is the stricter test, which we cover below. Meta also suggests separate opt-ins by message type, such as order updates and offers, with a clear way to opt out of each. That keeps blocks and reports down, which protects your quality rating.

How do messaging limits and quality ratings work?

A messaging limit is how many different customers you can start conversations with in a rolling 24 hours. It doesn’t cap your replies inside an open window. Limits are set for your whole business portfolio, so every number in it shares them.

Each automatic step comes within 6 hours of qualifying. To qualify, you must have used at least half your limit in the last 7 days, with high-quality messages.

Quality comes from how customers react. Each template gets a high, medium or low rating, based on negative feedback and read rates. A low-rated template can be paused or disabled. Since October 2025, Meta says a drop in your number’s quality rating no longer cuts its messaging limit. It can still stop you climbing.

WhatsApp also limits how many marketing messages one person receives from businesses, based on how engaged they are. A big marketing send won’t always land in full, whatever your limit.

What does the WhatsApp Business API cost in the UK?

There are two bills: Meta’s per-message fees, and whatever your provider or developers charge.

Meta’s UK rates

From Meta’s GBP rate card, effective 1 October 2026, for messages to UK numbers:

You’re only charged when a message is delivered, and messages customers send you are free. Utility and authentication get cheaper with volume. UK utility messages drop to £0.0151 each after the first 100,000 in a month. Meta only changes rates on the first day of a quarter, with at least a month’s notice. It raised the UK marketing rate on 1 July 2026.

Here’s a worked month for a home services firm, at those rates:

Provider and platform costs

Provider pricing is built differently, so compare what each adds per message as well as per month. Three examples, from their own pricing pages:

• Twilio adds $0.005 per message, sent or received, on top of Meta’s fees. Failed messages cost $0.001, and no monthly fee is listed.
• 360dialog charges €49, €99 or €500 a month per number, depending on plan. It says it adds no markup on Meta’s fees.
• Wati charges £49, £99 or £229 a month, billed annually, with three to five users included. Its message charges follow its own rate card.

None of these prices covers connecting WhatsApp to your booking, ordering or customer systems. That’s where the value is, and it’s priced by scope.

Can you put an AI chatbot on the WhatsApp Business API?

Yes, if it’s your business’s own assistant. Since 15 January 2026, Meta’s terms stop “AI Providers” offering general-purpose AI assistants on the platform, except where it’s legally required to allow them. Meta’s list of those markets doesn’t include the UK.

The rule is aimed at companies whose product is the chatbot, such as a ChatGPT-style assistant. Meta’s terms still let you use an AI provider as your own third-party service provider. A bot that books appointments, tracks orders or answers questions about your services is fine. Keep it focused on your business, and always offer a route to a person. WhatsApp’s Business Policy requires prompt, clear and direct escalation paths when you automate replies.

Meta also sells its own agent. Meta Business Agent answers from your FAQs, catalogue and website, and can hand over to your team. Meta puts a typical message at around 4–5 US cents. Our guide to WhatsApp AI agents for UK businesses compares the options. For a worked example of AI answering customers, see AI customer service for UK small businesses.

What does UK GDPR mean for WhatsApp messages?

Customer chats are personal data, and promotional messages are direct marketing. Three things to get right:

• Consent for marketing. The ICO applies its electronic mail marketing rules to texts and social media direct messages. Treat WhatsApp offers the same way: consent, or the soft opt-in for existing customers who were offered an opt-out.
• Tell people. Your privacy notice should say you use WhatsApp, and which provider handles the messages.
• Contracts with processors. WhatsApp’s business data processing terms cover data it handles as your processor, with a UK data transfer addendum. Your provider is a processor too, and UK GDPR requires a written contract with it.

Order updates and replies aren’t marketing, but Meta’s opt-in rule still applies to them. Our guide to AI and GDPR for smaller businesses covers the AI side.

What does it look like at scale?

Electragram is an events platform we took over mid-season. It sends invitations by email, SMS and WhatsApp, each in the host’s own name, and guests reply in a tap. WhatsApp went live in April 2026. More than 1,000 Founders Forum guests are invited and managed on WhatsApp through it. That’s the API doing what the app can’t: one platform sending for many hosts, under their names, at volume.

What order should you do things in, and how long does it take?

Steps 3, 5 and 6 can run alongside step 7. Start the paperwork first, because it’s the part more people can’t speed up.

Where Contic fits

The API is the easy part. The value comes when WhatsApp is joined to the systems you already run. Customers book, confirm and get answers without waiting for someone to pick up a phone. That’s the work we do: connecting it to your systems, and building AI that replies for your business with a person one tap away.

Our first chat is free. You’ll get straight advice on whether you need the API at all, and what we’d do. Talk to us, or see our AI work.