Answer procurement policy questions with Google Drive, Gemini, and webhooks

Quick overview

This workflow exposes a webhook-based helpbot that answers employee questions using a policy PDF from Google Drive, generates a structured response with Google Gemini, and escalates low-confidence answers by creating a support ticket via an HTTP request.

How it works

1. Receives an employee question via a POST webhook request.
2. Fetches a policy PDF from a Google Drive download URL and extracts its text content.
3. Analyzes the document text to detect the likely policy domain and document structure, then builds a system prompt that instructs Google Gemini to answer using only the document.
4. Sends the prompt and the user’s question to Google Gemini and parses the model’s JSON response, including a confidence score.
5. If the confidence is 0.70 or higher, returns the policy-based answer (plus section, next action, and summary) as the webhook response.
6. If the confidence is below 0.70 (or parsing fails), creates a support ticket by POSTing the question and the bot’s best attempt to an external helpdesk endpoint and returns an escalation notice to the webhook caller.

Setup

1. Configure the webhook endpoint in your chatbot or frontend to POST a JSON body containing at least message, userId, channel, and sessionId.
2. Replace the Google Drive download URL in the PDF fetch step with your own policy document link that is accessible to n8n.
3. Add a Google Gemini (PaLM) API credential and select an appropriate Gemini model.
4. Set the helpdesk/ticketing system URL in the support-ticket HTTP request step and adjust the JSON payload fields to match your ticket API.

Additional info

Additional Possibilities

The same architecture can be adapted for:

• Employee handbooks
• SOP documentation
• Compliance manuals
• Vendor management guides
• Corporate knowledge bases
• Internal operating procedures
• Quality assurance documentation

and many other document-driven support use cases.

Troubleshooting Guide

Issue	Possible Cause	Solution
Webhook returns no response	Workflow inactive	Activate workflow and use production URL
PDF extraction fails	Invalid PDF URL or permissions issue	Verify PDF is publicly downloadable
Gemini node errors	Missing or invalid credentials	Reconnect Gemini API credentials
JSON parsing error	AI returned invalid JSON	Review prompt configuration and Gemini output
Constant escalations	Confidence threshold too high	Lower threshold from 0.70 to a suitable value
Empty answers returned	Policy content missing required information	Verify PDF contains the requested information
Ticket creation fails	Incorrect helpdesk API URL	Verify endpoint and authentication settings
Wrong policy domain detected	Domain keywords do not match document content	Update keyword patterns in analysis node
Slow responses	Large PDF size	Reduce document size or implement retrieval methods
Employee receives escalation unexpectedly	AI confidence below threshold	Review policy coverage and prompt instructions

Need Help?

Whether you need help with:

• n8n workflow setup
• Gemini AI integration
• Helpdesk integrations
• Slack or Teams deployment
• Policy document automation
• Multi-document knowledge bases
• Vector database integrations
• Enterprise AI assistants
• Hiring n8n developers

the team at WeblineIndia can help.

We can assist with workflow installation, customization, advanced integrations, performance optimization and development of similar AI-powered automation solutions tailored to your business processes.

If you need a custom version of this workflow or additional enterprise features, reach out to WeblineIndia for consultation and implementation support.