WhatsApp Business API explained

What it is

WhatsApp has three products that are easy to confuse:

The Platform's current form is the Cloud API, hosted by Meta. The older self-hosted On-Premises API was retired on 23 October 2025, so guides that talk about hosting your own API client are out of date.

Who needs it

• Support or sales teams where several named agents share one number, with assignment and reporting.
• Shops and services that send order updates, booking reminders, delivery notices or one-time passcodes automatically.
• Anyone who wants a chatbot, a CRM connection or opt-in marketing messages at volume.

If one or two people answer every chat by hand, the free Business app on WhatsApp Web is the right tool and the API is overkill.

How to get access

1. Pick a route. Either sign up with a software platform that works with Meta as a Solution Partner or Tech Provider (the usual route; many still call themselves a BSP), or create a Meta developer app and use the Cloud API directly.

2. Connect a number. Through the platform's signup you log in to Facebook, create or select a Meta Business portfolio and a WhatsApp Business Account, and verify a phone number by SMS or call. The number cannot be active in the regular WhatsApp app at the same time, unless you use a coexistence setup.

3. Set the display name, which Meta reviews against its naming rules.

4. Verify your business in Meta Business settings to lift the starting limits.

5. Create message templates for anything you will send first. Meta's review can take up to 24 hours and is usually much faster.

How pricing works

Since 1 July 2025 Meta charges per delivered template message, not per conversation. The price depends on the template's category and the country code of the person receiving it.

Examples from Meta's rate card effective 1 October 2026, in US dollars per delivered message:

Two more things decide your real bill. When a customer reaches you from the WhatsApp phone app through a click-to-WhatsApp ad or a Facebook Page button and you answer within 24 hours, a 72-hour window opens in which your messages are free. And most software platforms add their own subscription, and some add a markup on each message on top of Meta's fee; the comparison lists which.

Rules you work within

• Opt-in. You may only message people who opted in to messages from your business, and the opt-in must name your business clearly.
• The 24-hour window. After a customer writes, you can answer freely for 24 hours. Outside it, only approved templates can be sent.
• Template approval and categories. Meta reviews each template and decides whether it is marketing, utility or authentication.
• Messaging limits. A new business can start conversations with 250 different people per 24 hours. The next levels are 2,000, 10,000, 100,000 and unlimited, shared by all numbers of the business. Verifying the business lifts you to 2,000; after that the limit rises by itself when quality is high and you use at least half of it.
• Quality rating. Templates are rated from customer feedback and read rates. Low-rated templates are slowed, paused and finally disabled, and repeated policy violations lead to blocks of days or weeks.
• United States numbers. WhatsApp currently does not deliver marketing templates to United States numbers (+1 with a US area code). Utility and authentication templates and replies to US customers still work, and Canadian numbers are not affected.
• AI assistants. Since 15 January 2026 Meta's terms do not allow general-purpose AI assistants to be offered over the Business Platform. A bot that handles your own customers' questions is still allowed; see WhatsApp chatbots.

Platform or direct?

Going direct to the Cloud API costs nothing beyond Meta's message fees, and needs a developer to build the inbox, templates screen and webhooks you would otherwise rent. A platform gives you those on day one for a monthly fee. For nearly every small and mid-sized business the platform is cheaper than the developer time.

Developer-first options

Ready-made platforms

Shared inboxes, chatbot builders and CRM connections are compared on Best WhatsApp Business software.