The WhatsApp Business app is fine for manual chat. The API (via a provider like Twilio) lets you send automated messages, approved templates, and keep a stable business number — without depending on a physical phone.
Before proactive outreach, Meta requires an approved template (utility / marketing / authentication). Inside a 24-hour window after the customer writes, you can chat freely.
For an agent or reminders: the number is opened in the business's name with owner access. I connect the API to a CRM or Make/n8n, with human approval on every commitment.
If you only get a few inquiries a day, the app may be enough. With volume, templates, or an AI agent — the API is the right base. You can start from AI agents for business owners.
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- AI agents for business owners
- AI lead qualification
- What is an AI agent for a small business?
- Make vs n8n vs Zapier for small businesses