QQuillrooinquillroo.hashnode.dev·2h ago · 3 min readBuild an invoice reminder workflow in n8n with Google Sheets (idempotent, AU GST wording)Flow: Schedule Trigger (daily 9am, workflow timezone set) → Google Sheets "Get rows" → Code node (decide) → Send Email (SMTP) → Google Sheets "Update row" (match on row_number). The decision logic Sk01V