WhatsApp Business Cloud API

How to authenticate

1. 1Create a Meta developer account and a Business app at developers.facebook.com.
2. 2Add the WhatsApp product; you get a test number and temporary token instantly.
3. 3Verify your business and register your own number to go beyond the 5-recipient test limit.
4. 4Generate a permanent system-user token with whatsapp_business_messaging permission.
5. 5Configure a webhook (with verify token) to receive inbound messages.

Example request

curl -X POST 'https://graph.facebook.com/v21.0/PHONE_NUMBER_ID/messages' -H 'Authorization: Bearer TOKEN' -H 'Content-Type: application/json' -d '{"messaging_product":"whatsapp","to":"65XXXXXXXX","type":"text","text":{"body":"Hello from SG"}}'

Example response

{"messaging_product":"whatsapp","contacts":[{"input":"65XXXXXXXX","wa_id":"65XXXXXXXX"}],"messages":[{"id":"wamid.HBg..."}]}