{"workflow":{"id":14146,"name":"Flag duplicate and risky AP invoices with Gmail, OpenAI and Supabase","views":2,"recentViews":0,"totalViews":2,"createdAt":"2026-03-18T11:13:56.634Z","description":"## πŸš€ How it works\n\n Monitors your AP inbox for incoming invoices, extracts structured data\n with AI, runs duplicate and vendor history checks against Supabase, then\n scores each invoice for fraud risk β€” routing suspicious ones to Slack\n and your AP team before any payment is processed.\n\n - πŸ“¬ Gmail Trigger monitors your accounts payable inbox in real time\n - πŸ€– AI Agent extracts invoice number, vendor, amount, currency, dates\n and line items into structured JSON β€” no manual data entry\n - πŸ” Checks Supabase for duplicate invoice numbers already in the system\n - 🏒 Checks vendor payment history β€” flags unknown vendors and amount\n deviations above 50% from the vendor's historical average\n - 🧠 Second AI Agent scores fraud risk: **low / medium / high / critical**\n with specific fraud indicators and a recommended action\n - 🚨 **High/critical risk** β€” posts a detailed Slack alert to `#invoice-alerts`\n and emails your AP manager with a hold notice\n - πŸ—„οΈ Logs every processed invoice to Supabase with risk score and status\n\n ## πŸ› οΈ Set up steps\n\n **Estimated setup time: ~20 minutes**\n\n 1. **Gmail Trigger** β€” connect Gmail OAuth2; point it at your AP inbox\n 2. **OpenAI** β€” connect OpenAI API credential (used by both AI Agent nodes)\n 3. **Supabase** β€” connect Supabase API credential; create two tables:\n `invoices` (invoice_number, vendor_name, amount, status, risk_level, created_at)\n and `vendors` (vendor_name, avg_amount, total_invoices, flagged)\n 4. **Slack** β€” connect Slack OAuth2; update the channel name `#invoice-alerts`\n 5. **Gmail (Send)** β€” connect Gmail OAuth2; replace `ap-manager@example.com`\n 6. Follow the sticky notes inside the workflow for per-node guidance\n\n ## πŸ“‹ Prerequisites\n\n - Gmail account receiving invoices\n - OpenAI API key (GPT-4o)\n - Supabase project with `invoices` and `vendors` tables\n - Slack workspace with an alerts channel\n## Custom Workflow Request with Personal Dashboard\n\nkumar@smartflowcraft.com\n\nhttps://www.smartflowcraft.com/contact\n\n### More free templates\nhttps://www.smartflowcraft.com/n8n-templates","workflow":{"meta":{"instanceId":"22fdca31d9968d6f06af303ef9be6a073b9af5f54fda4c07e35417e4d15e704f","templateCredsSetupCompleted":true},"nodes":[{"id":"0ae5c983-ad78-4eb6-8f0e-dfbac8737338","name":"Overview","type":"n8n-nodes-base.stickyNote","position":[26176,7232],"parameters":{"color":7,"width":700,"height":356,"content":"## AP Invoice Fraud Detection\nVersion 1.0.0 β€” Finance\n\nProcesses incoming invoices from Gmail, extracts structured data with AI, checks Supabase for duplicate invoice numbers, validates vendor payment history, runs a risk assessment, and routes high-risk invoices to a Slack alert before logging all decisions.\n\nFlow: Gmail Trigger => Extract Invoice Data (AI Agent) => Check Duplicates (Supabase) => Count Duplicates (Code) => Check Vendor History (Supabase) => Merge All Context (Code) => Assess Fraud Risk (AI Agent) => High Risk? (IF) => Alert Slack + Log => Log to Supabase"},"typeVersion":1},{"id":"01b77a2c-55b4-41da-964c-e1947d447530","name":"Prerequisites","type":"n8n-nodes-base.stickyNote","position":[26880,7248],"parameters":{"color":5,"width":420,"height":344,"content":"## Prerequisites\n- Gmail account receiving invoices (Gmail OAuth2 credential)\n- OpenAI API key (GPT-4o)\n- Supabase project with two tables:\n - invoices: invoice_number, vendor_name, amount, status, created_at\n - vendors: vendor_name, total_invoices, avg_amount, last_invoice_date, flagged\n- Slack workspace and channel for fraud alerts (Slack OAuth2 or Bot Token)\n- Gmail for sending hold notifications (reuse same credential)"},"typeVersion":1},{"id":"4688febd-754b-45f3-ba5a-8e71073b0719","name":"Setup Required","type":"n8n-nodes-base.stickyNote","position":[27312,7248],"parameters":{"color":3,"width":420,"height":344,"content":"## Setup Required\n1. Gmail Trigger β€” connect Gmail OAuth2 credential\n2. Extract Invoice Data β€” connect OpenAI credential\n3. Check Duplicates + Check Vendor History β€” connect Supabase API credential, update table names\n4. Assess Fraud Risk β€” connect OpenAI credential\n5. Alert Slack β€” connect Slack credential, update #invoice-alerts channel name\n6. Send Hold Notice β€” connect Gmail OAuth2 credential, update your AP manager email\n7. Log Invoice + Log Fraud Flag β€” connect Supabase API credential"},"typeVersion":1},{"id":"966be176-d977-4cb1-ae2b-43a70082f232","name":"How It Works","type":"n8n-nodes-base.stickyNote","position":[26192,7600],"parameters":{"color":4,"width":500,"height":520,"content":"## How It Works\n1. Gmail Trigger detects new invoice emails (attach PDF or include invoice details in body)\n2. AI Agent extracts: invoice number, vendor, amount, invoice date, due date, line items\n3. Supabase checked for duplicate invoice numbers β€” Count Duplicates Code node prevents item multiplication\n4. Supabase checked for vendor payment history β€” Merge All Context Code node consolidates everything\n5. Second AI Agent scores fraud risk (low/medium/high/critical) with reasoning\n6. IF risk >= high: post Slack alert + send hold notice to AP team via email\n7. Invoice logged to Supabase invoices table regardless of risk outcome"},"typeVersion":1},{"id":"6327f8eb-6f67-4d01-ab54-46a95fc9110d","name":"Gmail β€” Invoice Inbox","type":"n8n-nodes-base.gmailTrigger","position":[26448,8016],"parameters":{"filters":{"includeSpamTrash":false},"pollTimes":{"item":[{"mode":"everyMinute"}]}},"typeVersion":1.2},{"id":"7310c22e-85cd-408d-ab0c-c9bb78448ec9","name":"Extract note","type":"n8n-nodes-base.stickyNote","position":[26704,7888],"parameters":{"width":238,"height":80,"content":"AI extracts structured invoice data from email subject, body, and attachments"},"typeVersion":1},{"id":"b25edce2-2aa5-42a0-9d37-bcc68978cba2","name":"Extract Invoice Data","type":"@n8n/n8n-nodes-langchain.agent","position":[26704,8016],"parameters":{"text":"=Extract all invoice data from this email.\n\nFrom: {{ $json.from }}\nSubject: {{ $json.subject }}\nBody: {{ $json.text || $json.snippet }}\n\nExtract the invoice number, vendor/supplier name, total amount (as a number), currency, invoice date, due date, and a list of line items if visible. If any field is not present, use null.","options":{"systemMessage":"You are an accounts payable assistant. Extract structured invoice data precisely from email content. Invoice numbers typically follow patterns like INV-12345, 2024-001, or similar. Amounts should be numeric only (no currency symbols). Dates should be ISO 8601 format (YYYY-MM-DD). If the email does not appear to be an invoice, set is_invoice to false.","returnIntermediateSteps":false},"promptType":"define","hasOutputParser":true},"typeVersion":1.8},{"id":"d6d79de4-0bec-4773-913e-56e0729d0b9d","name":"OpenAI β€” Extract","type":"@n8n/n8n-nodes-langchain.lmChatOpenAi","position":[26592,8208],"parameters":{"model":{"__rl":true,"mode":"list","value":"gpt-4o"},"options":{"temperature":0}},"typeVersion":1.2},{"id":"ead44960-92f3-469c-96fb-37fbff3ed761","name":"Invoice Data Schema","type":"@n8n/n8n-nodes-langchain.outputParserStructured","position":[26896,8208],"parameters":{"schemaType":"manual","inputSchema":"{\"type\":\"object\",\"properties\":{\"invoice_number\":{\"type\":\"string\"},\"vendor_name\":{\"type\":\"string\"},\"amount\":{\"type\":\"number\"},\"currency\":{\"type\":\"string\"},\"invoice_date\":{\"type\":\"string\"},\"due_date\":{\"type\":\"string\"},\"line_items\":{\"type\":\"array\",\"items\":{\"type\":\"object\"}},\"is_invoice\":{\"type\":\"boolean\"}},\"required\":[\"invoice_number\",\"vendor_name\",\"amount\",\"currency\",\"is_invoice\"]}"},"typeVersion":1.2},{"id":"d121a56a-10dc-4717-9fcd-bce791f9f6c8","name":"Duplicates note","type":"n8n-nodes-base.stickyNote","position":[26976,7888],"parameters":{"width":228,"height":80,"content":"Queries invoices table for existing records with same invoice number"},"typeVersion":1},{"id":"6cfe2bca-abc4-487b-afa4-a703a4872c51","name":"Check Duplicates","type":"n8n-nodes-base.supabase","onError":"continueErrorOutput","maxTries":3,"position":[27024,8016],"parameters":{"filters":{"conditions":[{"keyName":"invoice_number","keyValue":"={{ $json.output.invoice_number }}","condition":"eq"}]},"tableId":"invoices","operation":"getAll","returnAll":true},"retryOnFail":true,"typeVersion":1,"waitBetweenTries":2000},{"id":"29b2c5f3-d98d-4591-a0e4-0f160a7bed70","name":"Count Dup note","type":"n8n-nodes-base.stickyNote","position":[27232,7888],"parameters":{"width":255,"height":96,"content":"Consolidates duplicate rows into a single item, counts matches"},"typeVersion":1},{"id":"28c6a089-8fa9-4f07-9fc8-ddff34d2464d","name":"Count Duplicates","type":"n8n-nodes-base.code","position":[27264,8000],"parameters":{"jsCode":"const dupRows = $input.all();\nconst invoice = $('Extract Invoice Data').first().json.output || {};\nreturn [{ json: {\n ...invoice,\n duplicate_count: dupRows.filter(r => !r.json.error).length\n}}];"},"typeVersion":2},{"id":"6f4b34db-9590-4e01-bf44-1ae1974f24ed","name":"Vendor note","type":"n8n-nodes-base.stickyNote","position":[27504,7840],"parameters":{"width":260,"height":60,"content":"Queries vendor history to detect unusual amounts or flagged suppliers"},"typeVersion":1},{"id":"ff913bf0-34d6-421f-a56b-154d50a1a2f4","name":"Check Vendor History","type":"n8n-nodes-base.supabase","onError":"continueErrorOutput","maxTries":3,"position":[27488,8000],"parameters":{"filters":{"conditions":[{"keyName":"vendor_name","keyValue":"={{ $json.vendor_name }}","condition":"eq"}]},"tableId":"vendors","operation":"getAll","returnAll":true},"retryOnFail":true,"typeVersion":1,"waitBetweenTries":2000},{"id":"aea77465-e803-45f8-bdf4-342b9aeb5040","name":"Merge Context note","type":"n8n-nodes-base.stickyNote","position":[27776,7888],"parameters":{"width":238,"height":80,"content":"Merges invoice data, duplicate count, and vendor history into one item for risk assessment"},"typeVersion":1},{"id":"574222db-ff63-48e2-b976-5671565b6084","name":"Merge All Context","type":"n8n-nodes-base.code","position":[27808,7984],"parameters":{"jsCode":"const vendorRows = $input.all();\nconst invoiceCtx = $('Count Duplicates').first().json;\nconst vendors = vendorRows.filter(r => !r.json.error).map(r => r.json);\nconst vendor = vendors[0] || null;\nreturn [{ json: {\n ...invoiceCtx,\n vendor_known: !!vendor,\n vendor_avg_amount: vendor ? vendor.avg_amount : null,\n vendor_flagged: vendor ? (vendor.flagged || false) : false,\n vendor_total_invoices: vendor ? vendor.total_invoices : 0,\n vendor_last_invoice_date: vendor ? vendor.last_invoice_date : null,\n amount_deviation_pct: vendor && vendor.avg_amount > 0\n ? Math.round(((invoiceCtx.amount - vendor.avg_amount) / vendor.avg_amount) * 100)\n : null\n}}];"},"typeVersion":2},{"id":"df6a0c96-f5e7-4d88-921c-e7a2c1ccb8fc","name":"Risk note","type":"n8n-nodes-base.stickyNote","position":[28032,7872],"parameters":{"width":254,"height":80,"content":"AI Agent scores fraud risk using duplicate count, vendor history, and amount deviation"},"typeVersion":1},{"id":"0732a5a9-3f99-45f8-be98-98a153e49537","name":"Assess Fraud Risk","type":"@n8n/n8n-nodes-langchain.agent","position":[28000,7984],"parameters":{"text":"=Assess the fraud risk for this invoice.\n\nInvoice Number: {{ $json.invoice_number }}\nVendor: {{ $json.vendor_name }}\nAmount: {{ $json.amount }} {{ $json.currency }}\nInvoice Date: {{ $json.invoice_date }}\nDue Date: {{ $json.due_date }}\n\nDuplicate Invoice Count (same number already in system): {{ $json.duplicate_count }}\nVendor Known in System: {{ $json.vendor_known }}\nVendor Previously Flagged: {{ $json.vendor_flagged }}\nVendor Average Invoice Amount: {{ $json.vendor_avg_amount }}\nAmount Deviation from Vendor Average: {{ $json.amount_deviation_pct }}%\nVendor Total Historical Invoices: {{ $json.vendor_total_invoices }}\n\nEvaluate the risk of fraud or payment error and provide a risk score and recommended action.","options":{"systemMessage":"You are an accounts payable fraud detection specialist. Evaluate invoices for: duplicate submissions, amounts significantly above vendor average (>50% deviation = high risk, >100% = critical), unknown vendors, previously flagged vendors, or suspicious timing patterns. Risk levels: low = approve automatically, medium = flag for review, high = hold pending approval, critical = block and escalate immediately. Always provide clear reasoning.","returnIntermediateSteps":false},"promptType":"define","hasOutputParser":true},"typeVersion":1.8},{"id":"46f49aa4-9f06-4f05-9124-dbc59982bd32","name":"OpenAI β€” Risk","type":"@n8n/n8n-nodes-langchain.lmChatOpenAi","position":[27776,8224],"parameters":{"model":{"__rl":true,"mode":"list","value":"gpt-4o"},"options":{"temperature":0}},"typeVersion":1.2},{"id":"4a9e9a7d-cde5-459d-945c-fb7715e3996d","name":"Fraud Risk Schema","type":"@n8n/n8n-nodes-langchain.outputParserStructured","position":[28240,8256],"parameters":{"schemaType":"manual","inputSchema":"{\"type\":\"object\",\"properties\":{\"risk_level\":{\"type\":\"string\",\"enum\":[\"low\",\"medium\",\"high\",\"critical\"]},\"risk_score\":{\"type\":\"integer\",\"minimum\":0,\"maximum\":100},\"fraud_indicators\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"reasoning\":{\"type\":\"string\"},\"recommended_action\":{\"type\":\"string\"},\"requires_hold\":{\"type\":\"boolean\"}},\"required\":[\"risk_level\",\"risk_score\",\"fraud_indicators\",\"reasoning\",\"recommended_action\",\"requires_hold\"]}"},"typeVersion":1.2},{"id":"d4f636eb-510b-4bc2-8b25-2a6686932d95","name":"High Risk note","type":"n8n-nodes-base.stickyNote","position":[28304,7856],"parameters":{"width":244,"height":80,"content":"Routes to Slack alert path if risk requires hold, otherwise logs directly"},"typeVersion":1},{"id":"c5def029-6c26-4e86-95d1-c450028478ea","name":"High Risk?","type":"n8n-nodes-base.if","position":[28336,7984],"parameters":{"options":{},"conditions":{"options":{"typeValidation":"loose"},"combinator":"and","conditions":[{"id":"cond-risk","operator":{"type":"boolean","operation":"equal"},"leftValue":"={{ $json.output.requires_hold }}","rightValue":true}]}},"typeVersion":2.2},{"id":"8384f3aa-f4ff-4c7f-931c-be290d9c6e8d","name":"Slack note","type":"n8n-nodes-base.stickyNote","position":[28560,7776],"parameters":{"width":207,"height":80,"content":"Posts fraud alert to #invoice-alerts Slack channel with full details"},"typeVersion":1},{"id":"fcae28cd-d96f-436f-849a-c37bd5fbc992","name":"Alert Slack","type":"n8n-nodes-base.slack","onError":"continueErrorOutput","maxTries":3,"position":[28592,7936],"webhookId":"605a0258-db6f-478d-91e0-08c4129f372f","parameters":{"text":"=*FRAUD ALERT β€” {{ $('Merge All Context').first().json.risk_level.toUpperCase() }} RISK*\n\n*Invoice:* {{ $('Merge All Context').first().json.invoice_number }}\n*Vendor:* {{ $('Merge All Context').first().json.vendor_name }}\n*Amount:* {{ $('Merge All Context').first().json.amount }} {{ $('Merge All Context').first().json.currency }}\n*Risk Score:* {{ $json.output.risk_score }}/100\n\n*Fraud Indicators:*\n{{ $json.output.fraud_indicators.join('\\n') }}\n\n*Reasoning:* {{ $json.output.reasoning }}\n\n*Recommended Action:* {{ $json.output.recommended_action }}","otherOptions":{}},"retryOnFail":true,"typeVersion":2.2,"waitBetweenTries":2000},{"id":"eb9876b9-9d8e-4b33-970a-44f4127c5ccc","name":"Send Hold Notice","type":"n8n-nodes-base.gmail","onError":"continueErrorOutput","maxTries":3,"position":[28832,7856],"webhookId":"2e832556-1608-4dfe-bf4e-97ecaf75d300","parameters":{"sendTo":"user@example.com","message":"=

Invoice Flagged for Review

The following invoice has been placed on hold pending your approval.

Invoice Number{{ $('Merge All Context').first().json.invoice_number }}
Vendor{{ $('Merge All Context').first().json.vendor_name }}
Amount{{ $('Merge All Context').first().json.amount }} {{ $('Merge All Context').first().json.currency }}
Risk Level{{ $('Assess Fraud Risk').first().json.output.risk_level.toUpperCase() }}
Risk Score{{ $('Assess Fraud Risk').first().json.output.risk_score }}/100

Fraud Indicators:
{{ $('Assess Fraud Risk').first().json.output.fraud_indicators.join('
') }}

Reasoning: {{ $('Assess Fraud Risk').first().json.output.reasoning }}

Recommended Action: {{ $('Assess Fraud Risk').first().json.output.recommended_action }}

","options":{},"subject":"=Invoice Hold β€” {{ $('Merge All Context').first().json.invoice_number }} from {{ $('Merge All Context').first().json.vendor_name }} ({{ $('Merge All Context').first().json.risk_level.toUpperCase() }} RISK)"},"retryOnFail":true,"typeVersion":2.1,"waitBetweenTries":2000},{"id":"e71db94f-fd18-4672-a665-f46ee1ca26d5","name":"Log Invoice note","type":"n8n-nodes-base.stickyNote","position":[29056,8000],"parameters":{"width":255,"height":60,"content":"Logs every processed invoice to Supabase for record keeping"},"typeVersion":1},{"id":"d056425b-4ac9-472c-b719-43a48f620c00","name":"Log Invoice to Supabase","type":"n8n-nodes-base.supabase","onError":"continueErrorOutput","maxTries":3,"position":[29120,8112],"parameters":{"operation":"insert"},"retryOnFail":true,"typeVersion":1,"waitBetweenTries":2000}],"pinData":{},"connections":{"High Risk?":{"main":[[{"node":"Alert Slack","type":"main","index":0}],[{"node":"Log Invoice to Supabase","type":"main","index":0}]]},"Alert Slack":{"main":[[{"node":"Send Hold Notice","type":"main","index":0}]]},"OpenAI β€” Risk":{"ai_languageModel":[[{"node":"Assess Fraud Risk","type":"ai_languageModel","index":0}]]},"Check Duplicates":{"main":[[{"node":"Count Duplicates","type":"main","index":0}]]},"Count Duplicates":{"main":[[{"node":"Check Vendor History","type":"main","index":0}]]},"Send Hold Notice":{"main":[[{"node":"Log Invoice to Supabase","type":"main","index":0}]]},"Assess Fraud Risk":{"main":[[{"node":"High Risk?","type":"main","index":0}]]},"Fraud Risk Schema":{"ai_outputParser":[[{"node":"Assess Fraud Risk","type":"ai_outputParser","index":0}]]},"Merge All Context":{"main":[[{"node":"Assess Fraud Risk","type":"main","index":0}]]},"OpenAI β€” Extract":{"ai_languageModel":[[{"node":"Extract Invoice Data","type":"ai_languageModel","index":0}]]},"Invoice Data Schema":{"ai_outputParser":[[{"node":"Extract Invoice Data","type":"ai_outputParser","index":0}]]},"Check Vendor History":{"main":[[{"node":"Merge All Context","type":"main","index":0}]]},"Extract Invoice Data":{"main":[[{"node":"Check Duplicates","type":"main","index":0}]]},"Gmail β€” Invoice Inbox":{"main":[[{"node":"Extract Invoice Data","type":"main","index":0}]]}}},"lastUpdatedBy":1,"workflowInfo":{"nodeCount":28,"nodeTypes":{"n8n-nodes-base.if":{"count":1},"n8n-nodes-base.code":{"count":2},"n8n-nodes-base.gmail":{"count":1},"n8n-nodes-base.slack":{"count":1},"n8n-nodes-base.supabase":{"count":3},"n8n-nodes-base.stickyNote":{"count":13},"n8n-nodes-base.gmailTrigger":{"count":1},"@n8n/n8n-nodes-langchain.agent":{"count":2},"@n8n/n8n-nodes-langchain.lmChatOpenAi":{"count":2},"@n8n/n8n-nodes-langchain.outputParserStructured":{"count":2}}},"status":"published","readyToDemo":null,"user":{"name":"Kumar SmartFlow Craft","username":"smartflowautomate","bio":"Founder of SmartFlowCraft β€” an AI agent platform for deploying production-ready automation for sales, support, and content ops. I build n8n workflow templates for real B2B use cases: SDR pipelines, churn detection, \n multi-agent orchestration, content repurposing, and revenue operations.","verified":true,"links":["https://www.smartflowcraft.com/"],"avatar":"https://gravatar.com/avatar/da2267caca3c05aef7c35ee3394094a845dd4b2d1696e5e455c8bf5e9ce8f1c6?r=pg&d=retro&size=200"},"nodes":[{"id":20,"icon":"fa:map-signs","name":"n8n-nodes-base.if","codex":{"data":{"alias":["Router","Filter","Condition","Logic","Boolean","Branch"],"details":"The IF node can be used to implement binary conditional logic in your workflow. You can set up one-to-many conditions to evaluate each item of data being inputted into the node. 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