Hiberius/whatsapp-receptionist — reverse-engineered prompt

Build me a polished SaaS app for an AI receptionist that works on WhatsApp for small businesses, especially Italian businesses.

Customers should be able to message or send voice notes on WhatsApp, the assistant should understand what they want, answer naturally, book real appointments in Google Calendar, send confirmations and reminders, and hand off to a human when it gets stuck. Business owners need an onboarding flow, a dashboard to manage conversations, availability, calendar connection, escalation rules, billing, and settings.

Use the official Meta WhatsApp Cloud API, Claude for the AI, ElevenLabs for voice transcription and speech, Supabase for auth and database, Google Calendar OAuth, Stripe subscriptions, and Fatture in Cloud for Italian electronic invoices. Make it multi tenant, self hosted friendly, GDPR ready, with export and delete data options, audit logs, privacy pages, and safe logging that hides personal data.

Also include a modern landing page, pricing, help pages, legal pages, admin panel, tests, and production ready security. Look up current docs online if you need to.