WhatsApp Appointment Management System with AI Chat, Reminders & Calendar Integration

This workflow automates appointment management via WhatsApp, integrating with Google Calendar for scheduling, reminders, and AI-driven customer interactions. It processes text, image, and audio messages, using OpenAI GPT-4 for conversational responses and Whisper for audio transcription, with multi-language support and human escalation. Key nodes include WhatsApp Webhook for input, Switch for message type routing, Google Calendar for scheduling, and OpenAI for text/image/audio processing. Ideal for clinics, salons, or consultants (1-50 users) handling 50+ daily appointments, reducing scheduling time from 5-10 minutes to seconds per booking.\n\nROI saves 6-10 hours weekly for businesses managing 100+ appointments, improving customer service and operational efficiency. Use cases include booking medical appointments, salon services, or consulting sessions. Requirements: OpenAI API key (~$0.02/1K tokens), Google Calendar OAuth2 (free with Google Workspace, ~$6/user/month), WhatsApp Business API (Meta or Evolution API, ~$0.01/message), PostgreSQL database (free or ~$10/month), n8n instance (free or cloud.n8n.io, ~$20/month), env vars (BUSINESS_NAME, BUSINESS_HOURS, TIMEZONE, LANGUAGE, WHATSAPP_API_URL, STAFF_NOTIFICATION_URL). Scalability supports thousands of daily messages; limited by WhatsApp API (~2,000 messages/day), OpenAI (~1,000 requests/minute), and Google Calendar API (~1,000 requests/day).\n\nInstall n8n from n8n.io or cloud.n8n.io. Obtain OpenAI key from platform.openai.com, Google Calendar OAuth2 via Google Cloud Console, WhatsApp API key from Meta/Evolution API, and PostgreSQL credentials from a provider (e.g., Supabase). Set env vars. Configure n8n credentials: HTTP Header Auth (WhatsApp), OpenAI, Google Calendar, PostgreSQL. Node setup: Webhook (POST, path: 'appointment-system-webhook'), GPT-4 (temperature 0.3, max_tokens 500), Google Calendar (primary calendar), PostgreSQL Memory (context window 20), WhatsApp Sender (dynamic URL). Expose webhook via ngrok.\n\nTest with POST requests (e.g., {body: {data: {key: {remoteJid: '1234567890@s.whatsapp.net', id: 'msg1'}, pushName: 'John', message: {conversation: 'Book an appointment for tomorrow at 10 AM'}}}) using Postman; verify calendar events and WhatsApp responses. Common errors: Invalid API keys (401—check credentials), missing message data (400—validate request), rate limits (429—add delays). Deploy by activating workflow, sharing webhook URL. Maintenance: Monitor API quotas, rotate keys quarterly, review PostgreSQL logs. Optimize: Adjust GPT temperature (0.2-0.5), refine calendar event formats, cache frequent availability checks.", "businessValue": "Saves 6-10 hours/week automating 100+ appointment bookings and reminders for businesses", "setupTime": "30-45 minutes", "difficulty": "Intermediate", "requirements": ["OpenAI API key", "Google Calendar OAuth2", "WhatsApp Business API key", "PostgreSQL database", "BUSINESS_NAME, BUSINESS_HOURS, TIMEZONE, LANGUAGE, WHATSAPP_API_URL, STAFF_NOTIFICATION_URL env vars", "n8n installation, API integration knowledge"], "useCase": "Automating appointment scheduling and reminders via WhatsApp for clinics, salons, or consultants"