Automate B2B supplier price negotiations with Google Sheets, Gmail, GPT-4o, Notion and Slack

Email & inbox workflow for n8n with 23 active steps. Starts with Google Sheets Trigger. Uses OpenAI. Integrations include Google Sheets, Gmail, Notion, Slack, OpenAI.

By Rahul JoshiWorkflowReference information

What it does

23 active nodes · Starts with Google Sheets Trigger.

Steps in the template include:

📋 Trigger — New Supplier Row1 (Google Sheets Trigger)
🔍 Validate & Prepare Supplier Data1 (Code)
🏆 Pick Best Draft1 (Code)
📝 Parse Final Critique Output1 (Code)

Nodes and integrations

Google Sheets Trigger
Code ×5
Gmail ×3
Google Sheets ×3
Wait
If
Notion
Slack ×2
OpenAI Chat Model ×3
AI Agent ×3

See the author’s step names

📋 Trigger — New Supplier Row1 (Google Sheets Trigger)
🔍 Validate & Prepare Supplier Data1 (Code)
🏆 Pick Best Draft1 (Code)
📝 Parse Final Critique Output1 (Code)
📧 Send Negotiation Email to Supplier1 (Gmail)
✅ Mark Email Sent in Sheet1 (Google Sheets) — update
⏳ Wait 24 Hours for Reply1 (Wait)
📬 Check Supplier Reply (Gmail)1 (Gmail) — getAll
❓ Reply Received?1 (If)
🔄 Build DPO Retry Prompt1 (Code)
📧 Send Follow-Up Retry Email1 (Gmail)
✅ Mark Retry Sent in Sheet1 (Google Sheets) — update
⚙️ Process & Score Supplier Reply1 (Code)
📒 Log Negotiation Result in Notion1 (Notion)
📊 Final Update in Google Sheets1 (Google Sheets) — update
🔔 Slack — Alert Procurement Team1 (Slack)
🔔 Slack — Retry Alert to Team1 (Slack)
⚡ LLM — Draft Generator (GPT-4o)1 (OpenAI Chat Model)
🧠 MCTS — Generate 3 Negotiation Drafts1 (AI Agent)
⚡ LLM — Critique Model (GPT-4o)1 (OpenAI Chat Model)
🔁 Self-Critique Round 1 — Refine Draft1 (AI Agent)
⚡ LLM — Final Polish Model (GPT-4o)1 (OpenAI Chat Model)
🔁 Self-Critique Round 2 — Final Polish1 (AI Agent)

Accounts and credentials

Google Sheets
Gmail
Notion
Slack
OpenAI access

Credential types in the graph: googleSheetsTriggerOAuth2Api, gmailOAuth2, googleSheetsOAuth2Api, notionApi, openAiApi

AI models and swaps

OpenAI · Chat

gpt-4o-mini in ⚡ LLM — Draft Generator (GPT-4o)1. Potentially swappable with a compatible n8n chat model node. Test the replacement with the next step.

OpenAI · Chat

gpt-4o-mini in ⚡ LLM — Critique Model (GPT-4o)1. Potentially swappable with a compatible n8n chat model node. Test the replacement with the next step.

OpenAI · Chat

gpt-4o-mini in ⚡ LLM — Final Polish Model (GPT-4o)1. Potentially swappable with a compatible n8n chat model node. Test the replacement with the next step.

Resource information

Credit basis: Author listed by n8n
Pricing: Template access shown on n8n
License: Not specified
Last record update: Nov 5, 2026