Automate Vendor Contract Renewals & Reminders with GPT-4.1 mini, Slack & Gmail

Description

📝 Smart Vendor Contract Renewal & Reminder Workflow With GPT 4.1 mini
Watch the demo video below:

Never miss a vendor renewal again!
This smart workflow automatically tracks expiring contracts, reminds your finance team via Slack, and helps initiate renewal with vendors through email — all with built-in approval and logging. Perfect for managing both auto-renew and manual contracts.
📌 Who’s it for
This workflow is designed for Finance and Procurement teams responsible for managing vendor/service contracts. It ensures timely notifications for expiring contracts and automates the initiation of renewal conversations with vendors.

⚙️ How it works / What it does

⏰ Daily Trigger
Runs every day at 6:00 AM using a scheduler.

📄 Retrieve Contract List
Reads vendor contract data from a Google Sheet (or any data source).
Filters for contracts nearing their end date, using a Notice Period (days) field.

🔀 Branch Based on Renewal Type
Auto-Renew Contracts:
Compose a Slack message summarizing the auto-renewal.
Notify the finance contact via Slack.

Manual Renewal Contracts:
Use an OpenAI-powered agent to generate a meaningful Slack message.
Send message and wait for approval from the finance contact (e.g., within 8 hours).
Upon approval, generate a formal HTML email to the vendor.
Send the email to initiate the contract extension process.

📊 (Optional) Logging
Can be extended to log all actions (Slack messages, emails, approvals) to Google Sheets or other databases.

🛠️ How to set up

Prepare your Google Sheet
Include the following fields:
Vendor Name, Vendor Email, Service Type, Contract Start Date, Contract End Date, Notice Period (days), Renewal Type, Finance Contact, Contact Email, Slack ID, Contract Value, Notes.
Sample: https://docs.google.com/spreadsheets/d/1zdDgKyL0sY54By57Yz4dNokQC_oIbVxcCKeWJ6PADBM/edit?usp=sharing

Configure Integrations
🟢 Google Sheets API: To read contract data.
🔵 Slack API: To notify and wait for approval.
🧠 OpenAI API (GPT-4): To generate personalized reminders.
✉️ Email (SMTP/Gmail): To send emails to vendors.

Set the Daily Scheduler
Use a Cron node to trigger the workflow at 6:00 AM daily.

✅ Requirements

| Component | Required |
|----------------------------------|----------|
| Google Sheets API | ✅ |
| Slack API | ✅ |
| OpenAI API (GPT-4) | ✅ |
| Email (SMTP/Gmail) | ✅ |
| n8n (Self-hosted or Cloud) | ✅ |
| Contract Sheet with proper schema| ✅ |

🧩 How to customize the workflow
Adjust Reminder Period**: Modify the logic in the Find Expiring Vendors node (based on Contract End Date and Notice Period).
Change Message Tone or Format**: Customize the OpenAI agent's prompt or switch from plain text to branded HTML email.
Add Logging or Tracking: Add a node to append logs to a **Google Sheet, Notion, or database.
Replace Data Source: Swap out Google Sheets for **Airtable, PostgreSQL, or other CRM/database systems.
Adjust Wait/Approval Duration**: Modify the sendAndWait Slack node timeout (e.g., from 8 hours to 2 hours).

📦 Optional Extensions
🧾 Add PDF contract preview via Drive link
🧠 Use GPT to summarize renewal terms
🛠 Auto-create Jira task for contract review