n8n Warehouse Packing Slip PDF via pdfmill, Gmail & Drive

Automatically generate, email, and archive warehouse packing slips from paid orders

This n8n workflow listens for a paid-order webhook, validates the fulfilment payload, generates a price-free packing slip PDF using pdfmill, emails it to your warehouse via Gmail, and archives the same document to Google Drive—then returns a JSON confirmation.

What this workflow does

• Receives a POST webhook when a paid order is ready to fulfil (the paid-order-packing-slip endpoint).
• Validates and normalizes order data, including:
  • Order identity and dates
  • Ship-from and ship-to addresses
  • Warehouse email
  • Line items with SKU, description, and a positive integer quantity
• If validation fails, it stops and returns a single 400 JSON response describing the rejected fields.
• Generates a packing slip PDF from the pdfmill “packing-slip” template, using only validated order data (no pricing).
• Sends the PDF via Gmail to the warehouse email address.
• Uploads the same PDF to Google Drive for archiving in your selected folder.
• Waits for both tasks to complete, then responds with packing_slip_ready, including the order number and total unit count.

Use cases

• Warehousing teams that require a consistent packing slip format for every shipment.
• eCommerce/OMS setups that need reliable, automated PDF generation and fulfillment email dispatch.
• Operators who want audit-friendly storage of every generated packing slip in Google Drive.

Technical details

• Webhook: receives the paid order request
• if and code: validation, normalization, and error handling
• pdfmill: renders a price-free “packing-slip” PDF template
• Gmail: emails the PDF attachment to the warehouse
• Google Drive: archives the same PDF to a configured folder
• merge and sticky note: workflow orchestration and clarity

Setup tip: create credentials for pdfmill, Gmail, and Google Drive in n8n, then configure your ecommerce/OMS system to POST the required payload (including warehouseEmail, shipFrom, shipTo, and items) to your production webhook URL.