WhatsApp Business API: A Developer Guide to Integration

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The WhatsApp Business API allows backend systems to send and receive WhatsApp messages automatically, such as order updates, one-time passwords, reminders, and support replies. Unlike the WhatsApp Business app, which is operated manually, the Platform is built for software, with Meta hosting the Cloud API so developers need not run their own servers. Integrations rely on a Meta Business account, a registered phone number, an access token, and a webhook for incoming messages and status updates. Businesses must start conversations with pre-approved templates categorized as marketing, utility, or authentication, while a 24-hour customer service window permits free-form replies once a customer messages first. The guide also includes a Node.js example that sends an approved order-shipped template through a simple POST request to Meta's Graph API.

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