WhatsApp Business API essentials

The free app is built for one person on one phone. The API is built for a team: several agents answering from one number, approved templates, broadcasts to large lists, automation, and integration with your other tools. The app has a visual interface of its own; the API is accessed through a provider's dashboard.

A WhatsApp Business Account — the account on Meta's side that owns your phone numbers, message templates, display name and quality rating. It sits inside your Meta Business portfolio. Your provider creates and connects it during onboarding.

Marketing, utility and authentication. Marketing promotes something and costs the most. Utility reports on something the customer already set in motion, like an order update. Authentication delivers one-time passcodes. The category you pick determines both the price and how the template is reviewed.

Any message you send to start a conversation — rather than reply inside one — has to use a template Meta approved in advance. It is the mechanism that stops WhatsApp filling up with unsolicited bulk messages. Once approved, a template is reusable indefinitely.

Messages are end-to-end encrypted in transit in the same way as on consumer WhatsApp. Beyond that, security depends on your provider's handling of the data at rest and on your own access controls — who on your team can see conversations and export contacts.