N8N Audit Unpaid Deals: HighLevel + Stripe + Gemini + Slack

Catch unpaid “closed-won” deals in GoHighLevel—automatically audit, generate a verdict, and alert your team

This n8n workflow audits unpaid closed-won opportunities in GoHighLevel every hour by cross-checking Stripe payment status, GoHighLevel conversation history, and task deadlines. It then uses Google Gemini to produce a structured follow-up verdict, posting alerts to Slack and logging them in Google Sheets.

What this workflow does

• Runs hourly on a schedule to fetch opportunities from a specific GoHighLevel pipeline stage.
• Filters to relevant deals (monetary value > 0) and skips opportunities already alerted by checking a Google Sheets “Notification Log”.
• For each new opportunity, pulls the contact’s latest GoHighLevel conversation, message history, and any open/overdue tasks.
• Connects payment context via Stripe: finds the related Stripe customer, retrieves charges, and calculates how much has been paid since close and what remains outstanding.
• Builds an audit context with deterministic flags (e.g., no rep follow-up, stale follow-up, unanswered customer reply, overdue tasks, partial payment, or escalation due).
• Uses Google Gemini to generate a structured JSON verdict including severity, evidence, and a suggested customer follow-up message.
• Alerts only when needed by posting a formatted message to Slack and updating/adding the notification record in Google Sheets.

Use cases

• Preventing “closed-won but unpaid” deals from slipping through in GoHighLevel.
• Coordinating sales follow-up when customer replies are missing or tasks are overdue.
• Escalating partial-payment situations with evidence-based guidance generated by Gemini.

Technical details

• GoHighLevel (OAuth2 credential) to fetch closed-won opportunities and conversation/task data
• Stripe to retrieve charges and compute paid vs. outstanding amounts
• Google Gemini to produce a structured JSON verdict and follow-up suggestion
• Slack to post alerts
• Google Sheets to log notifications and prevent duplicates
• n8n nodes noted: if, set, code, slack, stripe, high level