Send invoice approval requests to Slack using easybits Extractor

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1. Workflow Overview

What This Workflow Does 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 o...

Best for

Invoice Processing automation workflows
AI Summarization automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.formtrigger, @easybits/n8n-nodes-extractor.easybitsextractor, n8n-nodes-base.set, n8n-nodes-base.httprequest, n8n-nodes-base.stickynote

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Felix.

Original n8n.io source

1.1 Workflow description

Title: Send invoice approval requests to Slack using easybits Extractor
Workflow name: Send invoice approval requests to Slack using easybits Extractor

What This Workflow Does

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 Approve / Reject / Flag buttons.

How It Works

Form Upload – A user uploads an invoice through the n8n web form
Extraction via easybits – The data URI is POSTed to the easybits Extractor, which returns structured invoice data
Field Mapping – Extracted fields are mapped + approval tier is calculated based on amount
Slack Notification – A message is posted to Slack with invoice details and interactive buttons

Approval Tiers

🟢 Standard: < €1,000
🟡 Medium: €1,000 – €5,000
🔴 High: > €5,000

Setup Guide

1. Create Your easybits Extractor Pipeline

Go to extractor.easybits.tech and create a new pipeline
Add the following fields to the mapping:

vendor_name – The supplier/company name on the invoice
invoice_number – The invoice reference number
invoice_date – The date on the invoice
total_amount – The total amount due (number only)
customer_name – The recipient/customer name

Copy your Pipeline ID and API Key

2. Connect the Nodes in n8n

Add the easybits Extractor node from the n8n community nodes
Enter your Pipeline ID and API Key as credentials
Create a Slack API credential using your Slack Bot Token and assign it to the Slack node
Update the Slack channel ID in the Send to Slack for Approval node to your target channel

3. Set Up the Slack App

Go to api.slack.com/apps and create a new app
Add Bot Token Scopes: chat:write, chat:write.public
Install the app to your workspace
Copy the Bot User OAuth Token (starts with xoxb-)
Enable Interactivity and set the Request URL to your approval handler webhook

4. Activate & Test

Click Active in the top-right corner of n8n
Open the form URL and upload a test invoice
Check Slack – you should see the approval message with buttons

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Invoice Upload Form

Type / Role: n8n-nodes-base.formTrigger - formTrigger
Config choices: Version 2.5

Block 2 - easybits Extractor: Extract Invoice Data

Type / Role: @easybits/n8n-nodes-extractor.easybitsExtractor - easybitsExtractor
Config choices: Version 2

Block 3 - Map Invoice Fields

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 4 - Send to Slack for Approval

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.3

Block 5 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 6 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 7 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 8 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 9 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Send invoice approval requests to Slack using easybits Extractor
Complexity	intermediate
Nodes	9
Categories	Invoice Processing, AI Summarization
Author	Felix
Published	31 Mar 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/14513/14513.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Invoice Processing workflows AI Summarization workflows

Frequently asked questions

What does Send invoice approval requests to Slack using easybits Extractor do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Invoice Processing, AI Summarization use case.

Felix

24 workflows

Nodes

n8n-nodes-base.formtrigger @easybits/n8n-nodes-extractor.easybitsextractor n8n-nodes-base.set n8n-nodes-base.httprequest n8n-nodes-base.stickynote

Complexity

intermediate

Published 31 Mar 2026

Likes 0

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Install path: /data/workflows/14513/14513.json

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Send invoice approval requests to Slack using easybits Extractor

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

What This Workflow Does

How It Works

Approval Tiers

Setup Guide

1. Create Your easybits Extractor Pipeline

2. Connect the Nodes in n8n

3. Set Up the Slack App

4. Activate & Test

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Invoice Upload Form

Block 2 - easybits Extractor: Extract Invoice Data

Block 3 - Map Invoice Fields

Block 4 - Send to Slack for Approval

Block 5 - Sticky Note

Block 6 - Sticky Note1

Block 7 - Sticky Note2

Block 8 - Sticky Note3

Block 9 - Sticky Note4

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions