Felix This workflow corresponds to n8n.io template #14515 — we link there as the canonical source.
This workflow follows the Google Sheets → Slack recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"name": "Invoice Approval Handler (Slack Listener)",
"tags": [
{
"name": "Finance"
},
{
"name": "Invoice Automation"
},
{
"name": "Slack"
}
],
"nodes": [
{
"id": "f024271f-524f-4ab5-b7fb-43ed93e2bea3",
"name": "Receive Slack Button Click",
"type": "n8n-nodes-base.webhook",
"position": [
-64,
416
],
"parameters": {
"path": "invoice-approval-handler",
"options": {},
"httpMethod": "POST"
},
"typeVersion": 2
},
{
"id": "3c8f8381-a479-4e37-a35a-32f185762422",
"name": "Parse Slack Payload",
"type": "n8n-nodes-base.set",
"position": [
208,
416
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "a493fcd6-0bf3-4887-bd69-4026c14c3d22",
"name": "payload",
"type": "object",
"value": "={{ JSON.parse($json.body.payload) }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "e22d06ad-d82d-433d-8360-3089e8ad35e4",
"name": "Extract Decision & Invoice Data",
"type": "n8n-nodes-base.set",
"position": [
480,
416
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "ecc7c2a7-85a2-4bb6-8213-06b409ab9281",
"name": "decision",
"type": "string",
"value": "={{ $json.payload.actions[0].value }}"
},
{
"id": "d6f8aad0-508f-4a38-99ed-00eb76bcd7f8",
"name": "decided_by",
"type": "string",
"value": "={{ $json.payload.user.name }}"
},
{
"id": "277dbaef-143b-4603-85d4-b69f1284b3d9",
"name": "decided_by_id",
"type": "string",
"value": "={{ $json.payload.user.id }}"
},
{
"id": "44951b7f-73c9-48df-b8ce-189bbcaa2112",
"name": "channel_id",
"type": "string",
"value": "={{ $json.payload.channel.id }}"
},
{
"id": "224e0814-6d1f-4ff8-90d5-a08bb05da837",
"name": "message_ts",
"type": "string",
"value": "={{ $json.payload.message.ts }}"
},
{
"id": "1d96a304-f9ca-43e1-b1c2-590b8ce92c21",
"name": "supplier_name",
"type": "string",
"value": "={{ $json.payload.message.blocks[1].fields[0].text.split('\\n')[1] }}"
},
{
"id": "99f3f0a9-b595-4057-ac33-2421cc5b6ca5",
"name": "invoice_number",
"type": "string",
"value": "={{ $json.payload.message.blocks[1].fields[1].text.split('\\n')[1] }}"
},
{
"id": "fb44a6ec-6441-4c8e-9143-85fe7577211c",
"name": "amount",
"type": "string",
"value": "={{ $json.payload.message.blocks[1].fields[2].text.split('\\n')[1] }}"
},
{
"id": "3b17ccc8-108a-4586-b6de-2b1685b21539",
"name": "invoice_date",
"type": "string",
"value": "={{ $json.payload.message.blocks[1].fields[3].text.split('\\n')[1] }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "899c3038-7397-441e-990e-8ef38977fa97",
"name": "Route: Approved / Rejected / Flagged",
"type": "n8n-nodes-base.switch",
"position": [
752,
400
],
"parameters": {
"rules": {
"values": [
{
"outputKey": "Approved",
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.decision }}",
"rightValue": "approved"
}
]
},
"renameOutput": true
},
{
"outputKey": "Rejected",
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.decision }}",
"rightValue": "rejected"
}
]
},
"renameOutput": true
},
{
"outputKey": "Flagged",
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.decision }}",
"rightValue": "flagged"
}
]
},
"renameOutput": true
}
]
},
"options": {}
},
"typeVersion": 3.2
},
{
"id": "dfe0a576-d0f1-4b6e-affb-ec93ab80597f",
"name": "Log to Sheets: Approved",
"type": "n8n-nodes-base.googleSheets",
"position": [
1024,
240
],
"parameters": {
"columns": {
"value": {
"Date": "={{ $json.invoice_date }}",
"Amount": "={{ $json.amount }}",
"Supplier Name": "={{ $json.supplier_name }}",
"Invoice Number": "={{ $json.invoice_number }}"
},
"schema": [
{
"id": "Supplier Name",
"type": "string",
"display": true,
"required": false,
"displayName": "Supplier Name",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Invoice Number",
"type": "string",
"display": true,
"required": false,
"displayName": "Invoice Number",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Amount",
"type": "string",
"display": true,
"required": false,
"displayName": "Amount",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Date",
"type": "string",
"display": true,
"required": false,
"displayName": "Date",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": []
},
"options": {},
"operation": "append",
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Approved"
},
"documentId": {
"__rl": true,
"mode": "id",
"value": "YOUR_GOOGLE_SHEET_ID"
}
},
"typeVersion": 4.5
},
{
"id": "9fb05679-ed5b-44b2-a72a-e2f0f88ea622",
"name": "Log to Sheets: Rejected",
"type": "n8n-nodes-base.googleSheets",
"position": [
1024,
416
],
"parameters": {
"columns": {
"value": {
"Date": "={{ $json.invoice_date }}",
"Amount": "={{ $json.amount }}",
"Supplier Name": "={{ $json.supplier_name }}",
"Invoice Number": "={{ $json.invoice_number }}"
},
"schema": [
{
"id": "Supplier Name",
"type": "string",
"display": true,
"required": false,
"displayName": "Supplier Name",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Invoice Number",
"type": "string",
"display": true,
"required": false,
"displayName": "Invoice Number",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Amount",
"type": "string",
"display": true,
"required": false,
"displayName": "Amount",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Date",
"type": "string",
"display": true,
"required": false,
"displayName": "Date",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": []
},
"options": {},
"operation": "append",
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Rejected"
},
"documentId": {
"__rl": true,
"mode": "id",
"value": "YOUR_GOOGLE_SHEET_ID"
}
},
"typeVersion": 4.5
},
{
"id": "a2d9b4fe-16e0-4514-aa9c-daf65ee080ad",
"name": "Log to Sheets: Flagged",
"type": "n8n-nodes-base.googleSheets",
"position": [
1024,
592
],
"parameters": {
"columns": {
"value": {
"Date": "={{ $json.invoice_date }}",
"Amount": "={{ $json.amount }}",
"Supplier Name": "={{ $json.supplier_name }}",
"Invoice Number": "={{ $json.invoice_number }}"
},
"schema": [
{
"id": "Supplier Name",
"type": "string",
"display": true,
"required": false,
"displayName": "Supplier Name",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Invoice Number",
"type": "string",
"display": true,
"required": false,
"displayName": "Invoice Number",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Amount",
"type": "string",
"display": true,
"required": false,
"displayName": "Amount",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Date",
"type": "string",
"display": true,
"required": false,
"displayName": "Date",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": []
},
"options": {},
"operation": "append",
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Flagged"
},
"documentId": {
"__rl": true,
"mode": "id",
"value": "YOUR_GOOGLE_SHEET_ID"
}
},
"typeVersion": 4.5
},
{
"id": "f444c5fb-0d76-413d-b170-4dd085d668c8",
"name": "Slack DM: Approved \u2705",
"type": "n8n-nodes-base.slack",
"position": [
1296,
240
],
"parameters": {
"text": "=\u2705 *Invoice Approved & Ready to Pay*\n\n*Supplier:* {{ $json['Supplier Name'] }}\n*Invoice #:* {{ $json['Invoice Number'] }}\n*Amount:* {{ $json.Amount }}\n*Date:* {{ $json.Date }}\n*Approved by:* {{ $('Route: Approved / Rejected / Flagged').item.json.decided_by }}",
"user": {
"__rl": true,
"mode": "id",
"value": "YOUR_USER_ID"
},
"select": "user",
"otherOptions": {}
},
"typeVersion": 2.3
},
{
"id": "58e53f7a-c8f1-4ddd-b8ad-f16691d55cab",
"name": "Slack DM: Rejected \u274c",
"type": "n8n-nodes-base.slack",
"position": [
1296,
416
],
"parameters": {
"text": "=\u274c *Invoice Rejected*\n\n*Supplier:* {{ $json['Supplier Name'] }}\n*Invoice #:* {{ $json['Invoice Number'] }}\n*Amount:* {{ $json.Amount }}\n*Date:* {{ $json.Date }}\n*Rejected by:* {{ $('Route: Approved / Rejected / Flagged').item.json.decided_by }}",
"user": {
"__rl": true,
"mode": "id",
"value": "YOUR_USER_ID"
},
"select": "user",
"otherOptions": {}
},
"typeVersion": 2.3
},
{
"id": "5473fdea-f831-4da8-8c0d-94fcae527931",
"name": "Slack DM: Flagged \ud83d\udea9",
"type": "n8n-nodes-base.slack",
"position": [
1296,
592
],
"parameters": {
"text": "=\ud83d\udea9 *Invoice Flagged for Review*\n\n*Supplier:* {{ $json['Supplier Name'] }}\n*Invoice #:* {{ $json['Invoice Number'] }}\n*Amount:* {{ $json.Amount }}\n*Date:* {{ $json.Date }}\n*Flagged by:* {{ $('Route: Approved / Rejected / Flagged').item.json.decided_by }}\n\n\u26a0\ufe0f Please review this invoice manually.",
"user": {
"__rl": true,
"mode": "id",
"value": "YOUR_USER_ID"
},
"select": "user",
"otherOptions": {}
},
"typeVersion": 2.3
},
{
"id": "45e5c100-b3c5-430d-b5cb-33c8ba1b7f8a",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-144,
320
],
"parameters": {
"color": 7,
"width": 256,
"height": 272,
"content": "### \ud83d\udd14 Slack Webhook\nReceives button click events from Slack Interactivity"
},
"typeVersion": 1
},
{
"id": "6ebf1842-3c96-425a-9cf5-454a491bb489",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
128,
320
],
"parameters": {
"color": 7,
"width": 256,
"height": 272,
"content": "### \ud83d\udce6 Parse Payload\nConverts Slack's URL-encoded payload into JSON object"
},
"typeVersion": 1
},
{
"id": "f536f100-b96e-45dd-aa23-8b2a36d7063f",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
400,
320
],
"parameters": {
"color": 7,
"width": 256,
"height": 272,
"content": "### \ud83d\udccb Extract Decision Data\nPulls decision, user, and invoice details from Slack message"
},
"typeVersion": 1
},
{
"id": "0c8770a8-1c00-455d-acb0-b6b6f3f48c5b",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
672,
288
],
"parameters": {
"color": 7,
"width": 256,
"height": 336,
"content": "### \ud83d\udd00 Route by Decision\nBranches flow: Approved \u2192 Rejected \u2192 Flagged"
},
"typeVersion": 1
},
{
"id": "3e58c7fc-8301-490f-acaa-85a013c82ef1",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
944,
144
],
"parameters": {
"color": 7,
"width": 256,
"height": 608,
"content": "### \ud83d\udcca Log to Sheets\nAppends invoice data to the appropriate Google Sheets tab"
},
"typeVersion": 1
},
{
"id": "783c33e9-68a3-4082-9184-a2a4db6f04e4",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
1216,
144
],
"parameters": {
"color": 7,
"width": 256,
"height": 608,
"content": "### \ud83d\udcac Send Confirmation\nNotifies the approver via Slack DM"
},
"typeVersion": 1
},
{
"id": "32f0f5bd-897b-49dc-b85f-71dcfe5505a6",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"position": [
-832,
-160
],
"parameters": {
"width": 672,
"height": 1264,
"content": "# \ud83d\udce5 Invoice Approval Handler\n(Slack Button Listener)\n\n## What This Workflow Does\nListens for button clicks from the **Invoice \u2192 Slack Approval** workflow. When someone clicks Approve, Reject, or Flag on an invoice in Slack, this workflow captures that decision, logs it to **Google Sheets**, and sends a confirmation notification.\n\n## How It Works\n1. **Webhook Trigger** \u2013 Receives POST request from Slack when a button is clicked\n2. **Parse Payload** \u2013 Extracts the JSON payload from Slack's request body\n3. **Extract Decision Data** \u2013 Pulls decision, user info, and invoice details from the message\n4. **Route by Decision** \u2013 Branches to Approved, Rejected, or Flagged path\n5. **Log to Sheets** \u2013 Appends invoice data to the appropriate sheet tab\n6. **Notify via Slack** \u2013 Sends confirmation DM to the approver\n\n## Decision Routes\n- \u2705 **Approved** \u2192 Logs to \"Approved\" sheet \u2192 DM confirmation\n- \u274c **Rejected** \u2192 Logs to \"Rejected\" sheet \u2192 DM confirmation\n- \ud83d\udea9 **Flagged** \u2192 Logs to \"Flagged\" sheet \u2192 DM for manual review\n\n---\n\n## Setup Guide\n\n### 1. Create Google Sheet\n1. Create a new Google Sheet with 3 tabs: `Approved`, `Rejected`, `Flagged`\n2. Add these column headers to each tab:\n - Supplier Name\n - Invoice Number\n - Amount\n - Date\n3. Copy the **Sheet ID** from the URL\n\n### 2. Connect the Nodes in n8n\n1. Add your **Google Sheets OAuth2** credential to all three logging nodes\n2. Update the **Document ID** in each Google Sheets node to your Sheet ID\n3. Add your **Slack API** credential to all three notification nodes\n4. Update the **User ID** in the notification nodes (or change to channel)\n\n### 3. Configure Slack Interactivity\n1. Go to **api.slack.com/apps** \u2192 your app \u2192 **Interactivity & Shortcuts**\n2. Set the Request URL to this workflow's webhook URL\n3. Save Changes\n\n### 4. Activate & Test\n1. Click **Active** in the top-right corner of n8n\n2. Trigger the Invoice Approval workflow to send a Slack message\n3. Click a button in Slack\n4. Check Google Sheets and Slack for results"
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"connections": {
"Parse Slack Payload": {
"main": [
[
{
"node": "Extract Decision & Invoice Data",
"type": "main",
"index": 0
}
]
]
},
"Log to Sheets: Flagged": {
"main": [
[
{
"node": "Slack DM: Flagged \ud83d\udea9",
"type": "main",
"index": 0
}
]
]
},
"Log to Sheets: Approved": {
"main": [
[
{
"node": "Slack DM: Approved \u2705",
"type": "main",
"index": 0
}
]
]
},
"Log to Sheets: Rejected": {
"main": [
[
{
"node": "Slack DM: Rejected \u274c",
"type": "main",
"index": 0
}
]
]
},
"Receive Slack Button Click": {
"main": [
[
{
"node": "Parse Slack Payload",
"type": "main",
"index": 0
}
]
]
},
"Extract Decision & Invoice Data": {
"main": [
[
{
"node": "Route: Approved / Rejected / Flagged",
"type": "main",
"index": 0
}
]
]
},
"Route: Approved / Rejected / Flagged": {
"main": [
[
{
"node": "Log to Sheets: Approved",
"type": "main",
"index": 0
}
],
[
{
"node": "Log to Sheets: Rejected",
"type": "main",
"index": 0
}
],
[
{
"node": "Log to Sheets: Flagged",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
Listens for button clicks from the Invoice → Slack Approval workflow. When someone clicks Approve, Reject, or Flag on an invoice in Slack, this workflow captures that decision, logs it to Google Sheets, and sends a confirmation notification. Webhook Trigger – Receives POST…
Source: https://n8n.io/workflows/14515/ — original creator credit. Request a take-down →
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