⚠️ Read Before You Start

Before sending or receiving messages, recipient numbers must be registered with your business account using the register() method. Unregistered numbers may cause methods to fail or messages not to be delivered.

Method: register()

Always register your test or recipient numbers before making API calls.
➡️ Learn more about the register method

Note

If a user sends a message to your business number (e.g., "hi"), their number is automatically registered. In this case, you do not need to call register() manually.

📖 For more details, see the official WhatsApp Business documentation on Registering Numbers.