n8n Gmail to Slack Support Reply Drafts with Stripe & GPT-4.1

Turn new Gmail support emails into Slack-ready reply drafts—instantly

This n8n workflow monitors your Gmail inbox, checks whether the sender is a Stripe customer, uses GPT-4.1 to draft a structured support response from Google Docs playbooks, and posts a Slack message for human approval—while also sending an immediate confirmation email to the customer.

What this workflow does

• Runs every minute when new emails arrive and processes only messages labeled INBOX.
• Builds escalation context by retrieving the full Gmail message and its thread history, formatting a transcript, and counting prior exchanges.
• Classifies the sender via Stripe by parsing the sender name/email and searching Stripe for a matching customer record.
• Selects the right support playbook from Google Docs, generates a confirmation email, and sends it via the Gmail API.
• Generates a reply draft with OpenAI (GPT-4.1-mini) as a structured JSON output (intent, sentiment, escalation flags, and an HTML email body) using the email content, thread context, and available Stripe details.
• Creates a Gmail draft reply in the original thread and converts the HTML draft into Slack mrkdwn.
• Posts to Slack the draft, classification, and escalation notes to a configured channel for review.

Use cases

• SaaS support teams that want faster first responses without losing control of tone or escalation rules.
• Operators who need consistent replies using Google Docs playbooks and context-aware drafting.
• Workflows that separate Stripe customers from non-customers to tailor messaging and escalation handling.

Technical details

• n8n nodes/integrations: gmail, slack, if, set, code, filter.
• OpenAI: GPT-4.1-mini generates a structured JSON draft (intent/sentiment/escalation + HTML body).
• Stripe: customer lookup by email to classify sender type.
• Google Docs: playbook-driven support content selection and reply scaffolding.
• Gmail: monitors INBOX, retrieves threads, sends confirmation emails, and creates draft replies.