Build a GDPR-Compliant Google Reviews System in 30 Minutes (Full n8n Tutorial)

Let me show you exactly how I built a system that: Automatically requests Google Reviews after purchase Flags negative reviews for immediate follow-up Syncs everything to a dashboard Is 100% GDPR-compliant (including double opt-in) Total time to build: 30 minutes. Total cost: €0 (self-hosted n8n). Prerequisites n8n installed (self-hosted or n8n.cloud) A Google Business Profile A webhook source (your shop/CRM) The Architecture Purchase Event → n8n Webhook → Delay (7 days) → Email Request → Google API → Dashboard ↓ Negative Review? → Slack Alert Step 1: Webhook Trigger Create a Webhook node that receives purchase data: { "email" : "customer@example.com" , "name" : "Max Mustermann" , "order_id" : "12345" , "product" : "Premium Service" , "date" : "2026-03-21" } Step 2: Add to Wait List (GDPR Compliance) Before sending anything, add a "confirmation" step: Store the email in a simple database Send a "Can we contact you about your experience?" email Only proceed if they click "Yes" This is t