n8n Webhook to Send PDF via WhatsApp with Supergreen

Send a PDF to WhatsApp automatically—triggered by an n8n webhook and delivered via Supergreen

This n8n workflow listens for incoming HTTP POST requests on the /send-invoice webhook endpoint and then sends a document (e.g., a PDF) to the specified phone number using Supergreen WhatsApp. Perfect for automating document delivery without manual copying and sending.

What this workflow does

• Receives a webhook request via HTTP POST to /send-invoice.
• Reads the request payload for:
  • fileUrl (the URL of the document to send)
  • recipientPhone (target phone number)
  • caption (optional)
  • filename (optional)
• Fetches the file from fileUrl and sends it as a WhatsApp document through Supergreen to recipientPhone.

Use cases

• Automate sending PDF invoices to customers right after another system confirms payment.
• Deliver quotations, tickets, or statements via WhatsApp when an internal approval process completes.
• Provide a simple webhook-based document delivery option for a SaaS admin panel—users submit a file URL and recipient number.

Technical details

• Webhook node: exposes the endpoint /send-invoice and accepts POST JSON payloads.
• Supergreen integration: uses n8n-nodes-supergreensupergreen to send a WhatsApp document using the provided fileUrl.
• Setup: add your Supergreen API credentials in n8n, then use the production webhook URL in your source system.

Bring WhatsApp document delivery into your automation stack with an n8n Webhook + Supergreen workflow—fast, targeted, and triggered by your API calls.