I want my application to trigger automated notifications through the official WhatsApp Business API. The core requirement is a clean, fully documented integration that lets my system send messages programmatically whenever specific events fire on our side. Key deliverables: • Connect my existing back-end (RESTful, JSON) to the WhatsApp Business API, handling authentication, message templates and rate limits. • Webhooks or callbacks set up so I can track delivery, read receipts and errors in real time. • Clear developer-level documentation and sample code showing how to add new notification events in the future. The build can be in Node.js, Python or PHP—whichever you are most comfortable maintaining. Production readiness, test sandbox credentials and basic logging are expected before final hand-over.