Zacx Public API
The Zacx Public API lets you send WhatsApp Business API messages, look up and update contacts, tag and assign them, and pull reports and wallet credits for your workspace.
Authentication. Every request carries your workspace API key as a
bearer token: Authorization: Bearer <your-api-key>. Find or generate the
key in the Zacx dashboard under Settings → API.
Phone numbers. Always include the country code, for example
919999999999 for an Indian number. Endpoints that accept a leading +
say so.
Responses. Successful calls return "status": "success" with the
result under data or a human-readable message. Failures return
"status": "error" with a stable code you can branch on and a message
for logs.