Matt Chong | n8n Creator This workflow corresponds to n8n.io template #7735 — we link there as the canonical source.
This workflow follows the Agent → Gmail recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "AI Auto-Detect Invoices from Gmail and Notify on Slack",
"nodes": [
{
"id": "df47f544-18a9-4eea-a02f-6e8618bdc903",
"name": "Schedule Trigger",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
-1488,
-16
],
"parameters": {
"rule": {
"interval": [
{
"field": "hours"
}
]
}
},
"typeVersion": 1.2
},
{
"id": "fb69e703-7747-4862-8208-0d0803f5ce8f",
"name": "AI Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"onError": "continueRegularOutput",
"position": [
-1040,
-16
],
"parameters": {
"text": "=You are an intelligent assistant that reads emails and determines whether the message is related to an invoice or a payment notification.\n\nYour tasks:\n1. Determine if the email is invoice-related.\n2. If yes, extract:\n - Due date (in YYYY-MM-DD format, or null)\n - Amount due (as a number, no currency symbols)\n\nAlways include these metadata values:\nId: {{ $json.id }}\nthreadId: {{ $json.threadId }}\nbody: {{ $json.text }}\nsubject: {{ $json.subject }}\nsender: {{ $json.from.value[0].name }}\n\nReturn only a valid JSON object in the format below:\n\n```json\n{\n \"is_invoice\": true or false,\n \"due_date\": \"YYYY-MM-DD\" or null,\n \"amount_due\": number or null,\n \"email_id\": \"string\",\n \"thread_id\": \"string\",\n \"sender\": \"string\",\n \"subject\": \"string\"\n}\n\n\n",
"options": {},
"promptType": "define",
"hasOutputParser": true
},
"typeVersion": 2.1
},
{
"id": "ff1adb6a-43d6-4b36-9c91-0046b0146565",
"name": "OpenAI Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
-1024,
208
],
"parameters": {
"model": {
"__rl": true,
"mode": "list",
"value": "gpt-4o",
"cachedResultName": "gpt-4o"
},
"options": {}
},
"typeVersion": 1.2
},
{
"id": "acc58349-b51f-4623-9a23-f740791483fb",
"name": "Structured Output Parser",
"type": "@n8n/n8n-nodes-langchain.outputParserStructured",
"position": [
-896,
208
],
"parameters": {
"schemaType": "manual",
"inputSchema": "{\n \"type\": \"object\",\n \"properties\": {\n \"is_invoice\": {\n \"type\": \"boolean\"\n },\n \"due_date\": {\n \"type\": [\"string\", \"null\"],\n \"format\": \"date\"\n },\n \"amount_due\": {\n \"type\": [\"number\", \"null\"]\n },\n \"email_id\": {\n \"type\": \"string\"\n },\n \"thread_id\": {\n \"type\": \"string\"\n },\n \"sender\": {\n \"type\": \"string\"\n },\n \"subject\": {\n \"type\": \"string\"\n }\n },\n \"required\": [\n \"is_invoice\",\n \"due_date\",\n \"amount_due\",\n \"email_id\",\n \"thread_id\",\n \"sender\",\n \"subject\"\n ]\n}"
},
"typeVersion": 1.3
},
{
"id": "436dccba-2b62-4ee9-b2c3-0581bc836ed7",
"name": "No Operation, do nothing",
"type": "n8n-nodes-base.noOp",
"position": [
-464,
80
],
"parameters": {},
"typeVersion": 1
},
{
"id": "4c1eb726-1666-4f5c-b4e0-8f938f3ef791",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1552,
208
],
"parameters": {
"width": 304,
"height": 224,
"content": "### \u26a0\ufe0f Setup Required \n- Connect your Gmail account using OAuth2 \n- Connect your Slack account using OAuth 2\n- Add your OpenAI API Key under **API Credentials** "
},
"typeVersion": 1
},
{
"id": "17c6acfe-6074-43f9-af78-8a2f7104df5b",
"name": "Get Unread Emails",
"type": "n8n-nodes-base.gmail",
"position": [
-1264,
-16
],
"parameters": {
"simple": false,
"filters": {
"readStatus": "unread"
},
"options": {},
"operation": "getAll"
},
"typeVersion": 2.1
},
{
"id": "51725993-99b5-4d9e-a562-4e762ca6a0a2",
"name": "Check If Email is Invoice",
"type": "n8n-nodes-base.if",
"position": [
-688,
-16
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "dc8158a0-29aa-4c7f-9de3-994a5d827331",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
},
"leftValue": "={{ $json.output.is_invoice }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "ec14d8de-cfab-4b53-a3b5-9aae1c3b808d",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1600,
-128
],
"parameters": {
"color": 5,
"width": 320,
"height": 272,
"content": "### \ud83d\udca1 Schedule Trigger \nThis runs every hour. \nYou can change the interval here depending on how often you want Gmail to be checked."
},
"typeVersion": 1
},
{
"id": "3f7e75ec-5a03-4664-b1ff-91f57bee2d9d",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-528,
-336
],
"parameters": {
"color": 5,
"width": 272,
"height": 400,
"content": "### \ud83d\udca1 Customize Notification Format \nYou can change the title in this node. For example: `Pay invoice from {{sender}} by {{due_date}}` \nInclude more invoice details in the notes field if needed.\n"
},
"typeVersion": 1
},
{
"id": "db70ae0c-794b-452e-b8cd-26574ff006a2",
"name": "Notify Slack User",
"type": "n8n-nodes-base.slack",
"position": [
-464,
-112
],
"parameters": {
"text": "=Invoice from {{ $json.output.sender }} \u2013 ${{ $json.output.amount_due }} due {{ $json.output.due_date }}",
"user": {
"__rl": true,
"mode": "username",
"value": ""
},
"select": "user",
"otherOptions": {},
"authentication": "oAuth2"
},
"typeVersion": 2.3
},
{
"id": "d9bc11f7-edb5-4521-9702-725c8fa736fc",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1120,
-256
],
"parameters": {
"color": 5,
"width": 400,
"height": 640,
"content": "### \ud83e\udd16 AI Agent\n\n\u2022 This node uses an AI prompt to detect whether an email is invoice-related.\n\u2022 You can customize the prompt to detect other types of emails (e.g., receipts, contracts).\n"
},
"typeVersion": 1
}
],
"connections": {
"AI Agent": {
"main": [
[
{
"node": "Check If Email is Invoice",
"type": "main",
"index": 0
}
]
]
},
"Schedule Trigger": {
"main": [
[
{
"node": "Get Unread Emails",
"type": "main",
"index": 0
}
]
]
},
"Get Unread Emails": {
"main": [
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Structured Output Parser": {
"ai_outputParser": [
[
{
"node": "AI Agent",
"type": "ai_outputParser",
"index": 0
}
]
]
},
"Check If Email is Invoice": {
"main": [
[
{
"node": "Notify Slack User",
"type": "main",
"index": 0
}
],
[
{
"node": "No Operation, do nothing",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
This workflow is ideal for freelancers, accountants, and finance teams who receive invoices in Gmail and want to automate their tracking process with AI.
Source: https://n8n.io/workflows/7735/ — original creator credit. Request a take-down →
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