n8n Webhook Workflow: WhatsApp Booking Confirmations via WAHA

Instant WhatsApp booking confirmations from an n8n webhook (via WAHA)

Automate your booking confirmations: this n8n Webhook Workflow receives customer booking details through a webhook and immediately sends a WhatsApp confirmation message using your self-hosted WAHA instance—then returns a clear JSON success or error response.

What this workflow does

• Receives booking data via a POST request to the workflow webhook: name, phone, date, time, and optional service.
• Validates required fields and normalizes the phone number to E.164 format.
• Builds a WhatsApp message payload using configurable CONFIG values (e.g., business name, country prefix, message template).
• Sends the confirmation by calling WAHA’s /api/sendText endpoint (through an HTTP request step) to deliver the text to the customer.
• Returns a JSON response to the caller indicating success, or includes validation error details if the request data is invalid.

Use cases

• Confirm appointments automatically from your website or booking form without manual texting.
• Send instant WhatsApp confirmations for service bookings (e.g., consultations), optionally including the service field.
• Use n8n as the “booking confirmation layer” between your form/CRM and WhatsApp via WAHA.

Technical details (n8n + WAHA)

• Nodes used: webhook, if, code, http request, respond to webhook, sticky note.
• Integration: self-hosted WAHA REST API with X-Api-Key header.
• Core requirement: a running WAHA instance (free, self-hosted) reachable from n8n.
• Setup highlights: update CONFIG (WAHA URL, session name, business name, default country prefix), ensure WAHA WhatsApp session is created/scanned, then activate the workflow and use the webhook URL.

Best for: n8n users, automation engineers, and SaaS operators who need reliable webhook-to-WhatsApp booking confirmations.