Felix This workflow corresponds to n8n.io template #14513 — we link there as the canonical source.
This workflow follows the Form Trigger → HTTP Request 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 \u2192 Slack Approval (powered by easybits)",
"tags": [
{
"name": "easybits"
},
{
"name": "Finance"
},
{
"name": "Invoice Automation"
},
{
"name": "AI"
}
],
"nodes": [
{
"id": "3f67804e-0440-4b23-a073-7305e2e28ae1",
"name": "Invoice Upload Form",
"type": "n8n-nodes-base.formTrigger",
"position": [
-16,
0
],
"parameters": {
"options": {},
"formTitle": "Invoice Upload",
"formFields": {
"values": [
{
"fieldType": "file",
"fieldLabel": "image"
}
]
},
"formDescription": "Upload Document"
},
"typeVersion": 2.5
},
{
"id": "89354feb-0386-401b-b2ae-cebc56255758",
"name": "easybits Extractor: Extract Invoice Data",
"type": "@easybits/n8n-nodes-extractor.easybitsExtractor",
"position": [
256,
0
],
"parameters": {},
"typeVersion": 2
},
{
"id": "11e57ed1-cd67-4ab5-9fd9-f9e79ab23966",
"name": "Map Invoice Fields",
"type": "n8n-nodes-base.set",
"position": [
528,
0
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "765af92d-48a8-4dcd-921f-90e3f7a24d86",
"name": "supplier_name",
"type": "string",
"value": "={{ $json.data.vendor_name }}"
},
{
"id": "3c7ea123-d091-4606-8b3d-d079801e1706",
"name": "invoice_number",
"type": "string",
"value": "={{ $json.data.invoice_number }}"
},
{
"id": "951876e7-a7b6-4d5d-ad6a-d55127810f94",
"name": "invoice_date",
"type": "string",
"value": "={{ $json.data.invoice_date }}"
},
{
"id": "434b58b3-678f-4fc4-9d3a-8d333f9506de",
"name": "total_amount",
"type": "string",
"value": "={{ $json.data.total_amount }}"
},
{
"id": "b8e43c31-2d1b-49e7-86dc-83f228488e02",
"name": "currency",
"type": "string",
"value": "EUR"
},
{
"id": "afe9e84d-d1d8-4197-88de-11583a3a9b5b",
"name": "approval_tier",
"type": "string",
"value": "={{ $json.data.total_amount >= 5000 ? 'high_value' : ($json.data.total_amount >= 1000 ? 'medium_value' : 'low_value') }}"
},
{
"id": "b7f6bfb5-e8c5-4351-a5ec-4cb95c938d54",
"name": "approver_channel",
"type": "string",
"value": "={{ $json.data.total_amount >= 5000 ? '#finance-leads' : '#invoice-review' }}"
},
{
"id": "61366345-a58b-4609-ad72-3026014ccff5",
"name": "customer_name",
"type": "string",
"value": "={{ $json.data.customer_name }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "4aa9ba77-eaeb-44ed-8a8e-87408690989b",
"name": "Send to Slack for Approval",
"type": "n8n-nodes-base.httpRequest",
"position": [
800,
0
],
"parameters": {
"url": "https://slack.com/api/chat.postMessage",
"method": "POST",
"options": {},
"jsonBody": "={\n \"channel\": \"YOUR_CHANNEL_ID\",\n \"text\": \"New invoice: {{ $json.supplier_name }} - {{ $json.currency }} {{ $json.total_amount }}\",\n \"blocks\": [\n {\"type\":\"header\",\"text\":{\"type\":\"plain_text\",\"text\":\"\ud83d\udcc4 New Invoice for Approval\"}},\n {\"type\":\"section\",\"fields\":[{\"type\":\"mrkdwn\",\"text\":\"*Supplier:*\\n{{ $json.supplier_name }}\"},{\"type\":\"mrkdwn\",\"text\":\"*Invoice #:*\\n{{ $json.invoice_number }}\"},{\"type\":\"mrkdwn\",\"text\":\"*Amount:*\\n{{ $json.currency }} {{ $json.total_amount }}\"},{\"type\":\"mrkdwn\",\"text\":\"*Date:*\\n{{ $json.invoice_date }}\"},{\"type\":\"mrkdwn\",\"text\":\"*Tier:*\\n{{ $json.approval_tier === 'high_value' ? '\ud83d\udd34 High (\u20ac5k+)' : $json.approval_tier === 'medium_value' ? '\ud83d\udfe1 Medium (\u20ac1k-5k)' : '\ud83d\udfe2 Standard (<\u20ac1k)' }}\"}]},\n {\"type\":\"actions\",\"elements\":[{\"type\":\"button\",\"text\":{\"type\":\"plain_text\",\"text\":\"\u2705 Approve\"},\"style\":\"primary\",\"value\":\"approved\",\"action_id\":\"invoice_approve\"},{\"type\":\"button\",\"text\":{\"type\":\"plain_text\",\"text\":\"\u274c Reject\"},\"style\":\"danger\",\"value\":\"rejected\",\"action_id\":\"invoice_reject\"},{\"type\":\"button\",\"text\":{\"type\":\"plain_text\",\"text\":\"\ud83d\udea9 Flag\"},\"value\":\"flagged\",\"action_id\":\"invoice_flag\"}]}\n ]\n}",
"sendBody": true,
"specifyBody": "json",
"authentication": "predefinedCredentialType",
"nodeCredentialType": "slackApi"
},
"typeVersion": 4.3
},
{
"id": "a3b4ea9f-ea6f-4f81-a229-6d8ca4d90777",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-96,
-112
],
"parameters": {
"color": 7,
"width": 256,
"height": 288,
"content": "### \ud83d\ude80 Form for Invoice Upload\nForm accepts invoice uploads (PDF, image)"
},
"typeVersion": 1
},
{
"id": "ccb4539d-f6b2-4dbf-8161-e4ce7e6f9b6e",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
176,
-112
],
"parameters": {
"color": 7,
"width": 256,
"height": 288,
"content": "### \ud83e\udd16 Data Extraction\neasybits Extractor pulls: supplier, invoice #, date, amount"
},
"typeVersion": 1
},
{
"id": "e5262e79-eea0-425f-839c-a110bccf519a",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
448,
-112
],
"parameters": {
"color": 7,
"width": 256,
"height": 288,
"content": "### \ud83d\udcca Field Mapping\nMaps extracted data + determines approval tier based on amount"
},
"typeVersion": 1
},
{
"id": "9f404edc-a313-4f4f-a184-2a1cc9e8f550",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
720,
-112
],
"parameters": {
"color": 7,
"width": 256,
"height": 288,
"content": "### \ud83d\udcac Slack Notification\nSends approval request with interactive buttons"
},
"typeVersion": 1
},
{
"id": "681da2ff-b940-428f-b5d8-d434ebd0190b",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-784,
-608
],
"parameters": {
"width": 672,
"height": 1296,
"content": "# \ud83d\udcc4 Invoice Approval Workflow\n(powered by easybits + Slack)\n\n## What This Workflow Does\nUpload an invoice (PDF, PNG, or JPEG) via a hosted web form. The file is sent to **easybits Extractor**, which extracts key invoice data (supplier, amount, date, etc.). Based on the amount, an approval tier is assigned. The invoice details are then posted to **Slack** with interactive Approve / Reject / Flag buttons.\n\n## How It Works\n1. **Form Upload** \u2013 A user uploads an invoice through the n8n web form\n2. **Extraction via easybits** \u2013 The data URI is POSTed to the easybits Extractor, which returns structured invoice data\n3. **Field Mapping** \u2013 Extracted fields are mapped + approval tier is calculated based on amount\n4. **Slack Notification** \u2013 A message is posted to Slack with invoice details and interactive buttons\n\n## Approval Tiers\n- \ud83d\udfe2 **Standard:** < \u20ac1,000\n- \ud83d\udfe1 **Medium:** \u20ac1,000 \u2013 \u20ac5,000\n- \ud83d\udd34 **High:** > \u20ac5,000\n\n---\n\n## Setup Guide\n\n### 1. Create Your easybits Extractor Pipeline\n1. Go to **extractor.easybits.tech** and create a new pipeline\n2. Add the following fields to the mapping:\n - `vendor_name` \u2013 The supplier/company name on the invoice\n - `invoice_number` \u2013 The invoice reference number\n - `invoice_date` \u2013 The date on the invoice\n - `total_amount` \u2013 The total amount due (number only)\n - `customer_name` \u2013 The recipient/customer name\n3. Copy your **Pipeline ID** and **API Key**\n\n### 2. Connect the Nodes in n8n\n1. Add the **easybits Extractor** node from the n8n community nodes\n2. Enter your **Pipeline ID** and **API Key** as credentials\n3. Create a **Slack API** credential using your Slack Bot Token and assign it to the Slack node\n4. Update the Slack channel ID in the **Send to Slack for Approval** node to your target channel\n\n### 3. Set Up the Slack App\n1. Go to **api.slack.com/apps** and create a new app\n2. Add Bot Token Scopes: `chat:write`, `chat:write.public`\n3. Install the app to your workspace\n4. Copy the **Bot User OAuth Token** (starts with `xoxb-`)\n5. Enable **Interactivity** and set the Request URL to your approval handler webhook\n\n### 4. Activate & Test\n1. Click **Active** in the top-right corner of n8n\n2. Open the form URL and upload a test invoice\n3. Check Slack \u2013 you should see the approval message with buttons"
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"connections": {
"Map Invoice Fields": {
"main": [
[
{
"node": "Send to Slack for Approval",
"type": "main",
"index": 0
}
]
]
},
"Invoice Upload Form": {
"main": [
[
{
"node": "easybits Extractor: Extract Invoice Data",
"type": "main",
"index": 0
}
]
]
},
"easybits Extractor: Extract Invoice Data": {
"main": [
[
{
"node": "Map Invoice Fields",
"type": "main",
"index": 0
}
]
]
}
}
}
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
Upload an invoice (PDF, PNG, or JPEG) via a hosted web form. The file is sent to easybits Extractor, which extracts key invoice data (supplier, amount, date, etc.). Based on the amount, an approval tier is assigned. The invoice details are then posted to Slack with interactive…
Source: https://n8n.io/workflows/14513/ — original creator credit. Request a take-down →
Related workflows
Workflows that share integrations, category, or trigger type with this one. All free to copy and import.
Automatically transform any website URL into a complete portfolio entry with professional screenshots and AI-generated Upwork project descriptions. Freelancers building their Upwork/portfolio from pas
HTTP Request, Google Drive, Google Sheets +2
Upload a document (PDF, PNG, JPEG) via a web form and let easybits Extractor classify it into one of your defined categories. Based on the classification result and a confidence score, the document is
Form Trigger, HTTP Request, Google Drive +1
This n8n workflow enables a Virtual Try-On experience where users upload a dress image and the system: Combines it with a fashion model image Generates a realistic try-on image* Generates a fashion wa
Form Trigger, Telegram, Discord +3
The Recap AI - Reverse Engineer Short Form AI Video. Uses formTrigger, httpRequest, slack. Event-driven trigger; 22 nodes.
Form Trigger, HTTP Request, Slack
Generate cinematic AI videos for social media, marketing campaigns, product demos, or creative projects. The workflow handles both text-to-video and image-to-video generation with automatic status pol
Form Trigger, HTTP Request, Telegram