This workflow follows the Emailreadimap → Emailsend recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Invoice Processing Automation",
"nodes": [
{
"parameters": {
"mailbox": "INBOX",
"subject": "Invoice",
"format": "raw",
"downloadAttachments": true,
"options": {}
},
"id": "inv1a2b3c-1111-2222-3333-444455556666",
"name": "Email Trigger",
"type": "n8n-nodes-base.emailReadImap",
"typeVersion": 2,
"position": [
250,
300
]
},
{
"parameters": {
"operation": "upload",
"driveId": {
"__rl": true,
"value": "YOUR_GOOGLE_DRIVE_ID",
"mode": "id"
},
"folderId": {
"__rl": true,
"value": "YOUR_INVOICES_FOLDER_ID",
"mode": "id"
},
"fileName": "={{ $binary.attachment.fileName }}",
"inputDataFieldName": "attachment",
"options": {}
},
"id": "inv2b3c4d-2222-3333-4444-555566667777",
"name": "Save to Google Drive",
"type": "n8n-nodes-base.googleDrive",
"typeVersion": 3,
"position": [
480,
300
]
},
{
"parameters": {
"modelId": {
"__rl": true,
"value": "gpt-4-vision-preview",
"mode": "id"
},
"messages": {
"values": [
{
"content": "=Extract invoice information from this document:\n\nInvoice Image:\n{{ $binary.attachment.data }}\n\nExtract and return JSON with:\n- invoice_number (string)\n- invoice_date (YYYY-MM-DD format)\n- due_date (YYYY-MM-DD format)\n- vendor_name (string)\n- vendor_address (string)\n- vendor_tax_id (string)\n- subtotal (number)\n- tax_amount (number)\n- tax_percentage (number)\n- total_amount (number)\n- currency (string)\n- line_items (array of objects with: description, quantity, unit_price, total)\n- payment_terms (string)\n- purchase_order_number (string if mentioned)\n- notes (any additional notes)\n- confidence_score (0-100)\n\nReturn only valid JSON."
}
]
},
"options": {
"temperature": 0.2
}
},
"id": "inv3c4d5e-3333-4444-5555-666677778888",
"name": "OCR Invoice Extraction",
"type": "@n8n/n8n-nodes-langchain.openAi",
"typeVersion": 1.3,
"position": [
710,
300
]
},
{
"parameters": {
"operation": "getAll",
"documentId": {
"__rl": true,
"value": "YOUR_GOOGLE_SHEET_ID",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "PurchaseOrders",
"mode": "name"
},
"options": {}
},
"id": "inv4d5e6f-4444-5555-6666-777788889999",
"name": "Fetch Purchase Orders",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4,
"position": [
940,
200
]
},
{
"parameters": {
"jsCode": "// Match Invoice with Purchase Order\nconst invoiceData = JSON.parse($input.first().json.message.content);\nconst purchaseOrders = $('Fetch Purchase Orders').all().map(item => item.json);\n\n// Find matching PO\nlet matchedPO = null;\nlet matchScore = 0;\n\nif (invoiceData.purchase_order_number) {\n matchedPO = purchaseOrders.find(po => \n po.po_number === invoiceData.purchase_order_number\n );\n}\n\n// Calculate match score\nif (matchedPO) {\n const amountMatch = Math.abs(matchedPO.total_amount - invoiceData.total_amount) < 1;\n const vendorMatch = matchedPO.vendor_name.toLowerCase() === invoiceData.vendor_name.toLowerCase();\n \n if (amountMatch && vendorMatch) {\n matchScore = 100;\n } else if (amountMatch || vendorMatch) {\n matchScore = 70;\n } else {\n matchScore = 50;\n }\n}\n\n// Determine status\nlet status = 'pending_review';\nlet requires_approval = true;\n\nif (matchScore === 100 && invoiceData.confidence_score >= 90) {\n status = 'auto_approved';\n requires_approval = false;\n} else if (matchScore >= 70) {\n status = 'pending_manual_review';\n} else {\n status = 'pending_review';\n}\n\n// Prepare invoice record\nconst invoiceRecord = {\n invoice_id: 'INV-' + Date.now(),\n invoice_number: invoiceData.invoice_number,\n invoice_date: invoiceData.invoice_date,\n due_date: invoiceData.due_date,\n vendor_name: invoiceData.vendor_name,\n vendor_address: invoiceData.vendor_address,\n vendor_tax_id: invoiceData.vendor_tax_id,\n subtotal: invoiceData.subtotal,\n tax_amount: invoiceData.tax_amount,\n tax_percentage: invoiceData.tax_percentage,\n total_amount: invoiceData.total_amount,\n currency: invoiceData.currency,\n line_items: JSON.stringify(invoiceData.line_items),\n payment_terms: invoiceData.payment_terms,\n purchase_order_number: invoiceData.purchase_order_number,\n matched_po: matchedPO ? matchedPO.po_number : null,\n match_score: matchScore,\n confidence_score: invoiceData.confidence_score,\n status: status,\n requires_approval: requires_approval,\n drive_url: $('Save to Google Drive').item.json.webViewLink,\n received_at: $now.toISO(),\n processed_at: $now.toISO()\n};\n\nreturn [{ json: invoiceRecord }];"
},
"id": "inv5e6f7a-5555-6666-7777-888899990000",
"name": "Match with PO",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1170,
300
]
},
{
"parameters": {
"operation": "append",
"documentId": {
"__rl": true,
"value": "YOUR_GOOGLE_SHEET_ID",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "InvoiceLog",
"mode": "name"
},
"columns": {
"mappingMode": "defineBelow",
"value": {
"invoice_id": "={{ $json.invoice_id }}",
"invoice_number": "={{ $json.invoice_number }}",
"invoice_date": "={{ $json.invoice_date }}",
"due_date": "={{ $json.due_date }}",
"vendor_name": "={{ $json.vendor_name }}",
"total_amount": "={{ $json.total_amount }}",
"currency": "={{ $json.currency }}",
"matched_po": "={{ $json.matched_po }}",
"match_score": "={{ $json.match_score }}",
"confidence_score": "={{ $json.confidence_score }}",
"status": "={{ $json.status }}",
"requires_approval": "={{ $json.requires_approval }}",
"drive_url": "={{ $json.drive_url }}",
"received_at": "={{ $json.received_at }}",
"processed_at": "={{ $json.processed_at }}"
},
"schema": []
},
"options": {}
},
"id": "inv6f7a8b-6666-7777-8888-999900001111",
"name": "Log Invoice",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4,
"position": [
1400,
300
]
},
{
"parameters": {
"rules": {
"values": [
{
"conditions": {
"boolean": [
{
"value1": "={{ $json.requires_approval }}",
"value2": true
}
]
},
"outputKey": "needs_approval"
}
]
},
"fallbackOutputKey": "auto_approved"
},
"id": "inv7a8b9c-7777-8888-9999-000011112222",
"name": "Check Approval Required",
"type": "n8n-nodes-base.switch",
"typeVersion": 3,
"position": [
1630,
300
]
},
{
"parameters": {
"fromEmail": "finance@yourcompany.com",
"toEmail": "finance-manager@yourcompany.com",
"subject": "=Invoice Approval Required - {{ $json.invoice_number }}",
"emailType": "text",
"message": "=Dear Finance Manager,\n\nA new invoice requires your approval.\n\nINVOICE DETAILS:\n- Invoice ID: {{ $json.invoice_id }}\n- Invoice Number: {{ $json.invoice_number }}\n- Invoice Date: {{ $json.invoice_date }}\n- Due Date: {{ $json.due_date }}\n- Vendor: {{ $json.vendor_name }}\n- Total Amount: {{ $json.currency }} {{ $json.total_amount }}\n\nMATCHING INFORMATION:\n- Purchase Order: {{ $json.matched_po || 'Not Found' }}\n- Match Score: {{ $json.match_score }}%\n- OCR Confidence: {{ $json.confidence_score }}%\n\nDOCUMENT:\n- Drive Link: {{ $json.drive_url }}\n\nPlease review and approve or reject this invoice.\n\nBest regards,\nInvoice Processing System",
"options": {}
},
"id": "inv8b9c0d-8888-9999-0000-111122223333",
"name": "Request Approval",
"type": "n8n-nodes-base.emailSend",
"typeVersion": 2,
"position": [
1860,
200
]
},
{
"parameters": {
"channel": "#finance-notifications",
"text": "=\u2705 Invoice Auto-Approved\n\nInvoice: {{ $json.invoice_number }}\nVendor: {{ $json.vendor_name }}\nAmount: {{ $json.currency }} {{ $json.total_amount }}\nDue Date: {{ $json.due_date }}\nMatch Score: {{ $json.match_score }}%\n\nDocument: {{ $json.drive_url }}",
"additionalFields": {
"parse_mode": "Markdown"
}
},
"id": "inv9c0d1e-9999-0000-1111-222233334444",
"name": "Notify Auto-Approval",
"type": "n8n-nodes-base.slack",
"typeVersion": 2.1,
"position": [
1860,
400
]
},
{
"parameters": {
"rule": {
"interval": [
{
"field": "cronExpression",
"expression": "0 9 * * *"
}
]
}
},
"id": "inv0d1e2f-0000-1111-2222-333344445555",
"name": "Daily Payment Check",
"type": "n8n-nodes-base.scheduleTrigger",
"typeVersion": 1.1,
"position": [
250,
600
]
},
{
"parameters": {
"operation": "getAll",
"documentId": {
"__rl": true,
"value": "YOUR_GOOGLE_SHEET_ID",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "InvoiceLog",
"mode": "name"
},
"options": {}
},
"id": "inv1e2f3a-1111-2222-3333-444455556666",
"name": "Fetch All Invoices",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4,
"position": [
480,
600
]
},
{
"parameters": {
"jsCode": "// Check for upcoming and overdue payments\nconst invoices = $input.all().map(item => item.json);\nconst today = new Date();\nconst in3Days = new Date(today.getTime() + 3 * 24 * 60 * 60 * 1000);\n\nconst upcomingPayments = [];\nconst overduePayments = [];\n\ninvoices.forEach(invoice => {\n if (invoice.status === 'approved' || invoice.status === 'auto_approved') {\n const dueDate = new Date(invoice.due_date);\n \n if (dueDate < today) {\n overduePayments.push(invoice);\n } else if (dueDate <= in3Days) {\n upcomingPayments.push(invoice);\n }\n }\n});\n\nreturn [{\n json: {\n upcoming_payments: upcomingPayments,\n overdue_payments: overduePayments,\n check_date: today.toISOString()\n }\n}];"
},
"id": "inv2f3a4b-2222-3333-4444-555566667777",
"name": "Check Payment Due Dates",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
710,
600
]
},
{
"parameters": {
"fromEmail": "finance@yourcompany.com",
"toEmail": "finance-team@yourcompany.com",
"subject": "=\u26a0\ufe0f Payment Reminders - {{ $now.toFormat('yyyy-MM-dd') }}",
"emailType": "text",
"message": "=Dear Finance Team,\n\nPlease find the payment reminders for today:\n\n\ud83d\udd34 OVERDUE PAYMENTS ({{ $json.overdue_payments.length }}):\n{{ $json.overdue_payments.map(inv => `- ${inv.invoice_number} - ${inv.vendor_name} - ${inv.currency} ${inv.total_amount} (Due: ${inv.due_date})`).join('\\n') }}\n\n\ud83d\udfe1 UPCOMING PAYMENTS (Next 3 Days) ({{ $json.upcoming_payments.length }}):\n{{ $json.upcoming_payments.map(inv => `- ${inv.invoice_number} - ${inv.vendor_name} - ${inv.currency} ${inv.total_amount} (Due: ${inv.due_date})`).join('\\n') }}\n\nPlease process these payments as soon as possible.\n\nBest regards,\nInvoice Processing System",
"options": {}
},
"id": "inv3a4b5c-3333-4444-5555-666677778888",
"name": "Send Payment Reminders",
"type": "n8n-nodes-base.emailSend",
"typeVersion": 2,
"position": [
940,
600
]
}
],
"connections": {
"Email Trigger": {
"main": [
[
{
"node": "Save to Google Drive",
"type": "main",
"index": 0
}
]
]
},
"Save to Google Drive": {
"main": [
[
{
"node": "OCR Invoice Extraction",
"type": "main",
"index": 0
}
]
]
},
"OCR Invoice Extraction": {
"main": [
[
{
"node": "Fetch Purchase Orders",
"type": "main",
"index": 0
}
]
]
},
"Fetch Purchase Orders": {
"main": [
[
{
"node": "Match with PO",
"type": "main",
"index": 0
}
]
]
},
"Match with PO": {
"main": [
[
{
"node": "Log Invoice",
"type": "main",
"index": 0
}
]
]
},
"Log Invoice": {
"main": [
[
{
"node": "Check Approval Required",
"type": "main",
"index": 0
}
]
]
},
"Check Approval Required": {
"main": [
[
{
"node": "Request Approval",
"type": "main",
"index": 0
}
],
[
{
"node": "Notify Auto-Approval",
"type": "main",
"index": 0
}
]
]
},
"Daily Payment Check": {
"main": [
[
{
"node": "Fetch All Invoices",
"type": "main",
"index": 0
}
]
]
},
"Fetch All Invoices": {
"main": [
[
{
"node": "Check Payment Due Dates",
"type": "main",
"index": 0
}
]
]
},
"Check Payment Due Dates": {
"main": [
[
{
"node": "Send Payment Reminders",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1"
}
}
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About this workflow
Invoice Processing Automation. Uses emailReadImap, googleDrive, openAi, googleSheets. Scheduled trigger; 13 nodes.
Source: https://github.com/kooroosh1363/agentic-automation-lab/blob/main/12-invoice-processing-automation/workflow.json — original creator credit. Request a take-down →
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