{"product_id":"gmail-receipt-ocr-to-google-sheets-with-gemini-slack-alerts-n8n","title":"Gmail Receipt OCR to Google Sheets with Gemini \u0026 Slack Alerts (n8n)","description":"\u003ch3\u003eAutomatically turn Gmail receipt attachments into Google Sheets expense rows—complete with Gemini extraction and Slack alerts\u003c\/h3\u003e\n\u003cp\u003eThis n8n workflow watches your inbox for receipt\/invoice emails, extracts expense details using \u003cstrong\u003eGoogle Gemini\u003c\/strong\u003e, logs everything into \u003cstrong\u003eGoogle Sheets\u003c\/strong\u003e, and notifies \u003cstrong\u003eFinance in Slack\u003c\/strong\u003e when an expense crosses your configured limit—then sends confirmation emails to employees.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonitors Gmail every minute\u003c\/strong\u003e for incoming receipt\/invoice\/expense messages with attachments, downloads the attachment, and proceeds when a match is found.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUses Gemini Receipt OCR extraction\u003c\/strong\u003e: sends the attachment image to \u003cstrong\u003eGoogle Gemini\u003c\/strong\u003e to extract structured fields (e.g., vendor, date, amount, tax, currency, category, payment method, and more) as \u003cem\u003eJSON\u003c\/em\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParses, validates, and enriches\u003c\/strong\u003e the AI JSON, adds the \u003cstrong\u003eGmail sender\u003c\/strong\u003e as the employee fallback, generates an \u003cstrong\u003eexpense ID\u003c\/strong\u003e, and flags whether the amount exceeds the configured expense limit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWrites to Google Sheets\u003c\/strong\u003e: appends or updates the expense record using the \u003cstrong\u003eExpense ID\u003c\/strong\u003e as the matching key.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTriggers Slack + email workflows\u003c\/strong\u003e:\n    \u003cul\u003e\n      \u003cli\u003eIf the expense is \u003cstrong\u003eover the limit\u003c\/strong\u003e, posts an approval-required alert in a \u003cstrong\u003eSlack\u003c\/strong\u003e finance channel, then emails the employee a processed receipt notification.\u003c\/li\u003e\n      \u003cli\u003eIf it’s \u003cstrong\u003ewithin the limit\u003c\/strong\u003e, emails the employee a processed receipt notification.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenerates a monthly report\u003c\/strong\u003e: runs on a schedule, reads all rows from Google Sheets, calculates totals (amount, tax, averages, category and employee breakdowns, and highest expense), and emails the monthly report to Finance via Gmail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eExpense reimbursement workflows where receipts arrive via Gmail with attachments\u003c\/li\u003e\n  \u003cli\u003eSmall finance teams needing \u003cstrong\u003eSlack approvals\u003c\/strong\u003e for out-of-policy spending\u003c\/li\u003e\n  \u003cli\u003eAutomation engineers deploying reliable \u003cstrong\u003eGmail → Gemini → Google Sheets\u003c\/strong\u003e data pipelines in n8n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003en8n trigger\u003c\/strong\u003e: Gmail receipt\/invoice query polling (every minute)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrations\u003c\/strong\u003e: Gmail (trigger + send), \u003cstrong\u003eGoogle Sheets\u003c\/strong\u003e, \u003cstrong\u003eSlack\u003c\/strong\u003e, \u003cstrong\u003eGoogle Gemini\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorkflow logic\u003c\/strong\u003e: \u003cem\u003eif\u003c\/em\u003e, \u003cem\u003ecode\u003c\/em\u003e, and other supporting nodes (e.g., receipt handling and notes)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAI output handling\u003c\/strong\u003e: JSON extraction, parsing\/validation, and expense limit flagging\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":46206043455667,"sku":"N8N-20785","price":40.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/6gvAYPlBtnqI0ujpv3ONH_IRvbX59k.png?v=1791796034","url":"https:\/\/buyflowscripts.com\/products\/gmail-receipt-ocr-to-google-sheets-with-gemini-slack-alerts-n8n","provider":"N8N Commerce","version":"1.0","type":"link"}