AI invoice agent

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

AI Invoice Agent The AI Invoice Agent automates the invoice creation, email delivery, and status tracking process for client billing. It ensures invoices are generated, sent professionally, and ...

Best for

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

Tools used

n8n-nodes-base.manualtrigger, n8n-nodes-base.googlesheets, n8n-nodes-base.filter, n8n-nodes-base.set, n8n-nodes-base.splitinbatches, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.informationextractor, n8n-nodes-craftmypdf.craftmypdf

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: AI invoice agent
Workflow name: AI invoice agent

📄 AI Invoice Agent

The AI Invoice Agent automates the invoice creation, email delivery, and status tracking process for client billing. It ensures invoices are generated, sent professionally, and updated in Google Sheets with minimal manual work.

🔹 How It Works

Trigger
- Activated manually (Execute Workflow) when you want to process invoices.
Fetch Invoices
- Reads client invoice data from a Google Sheet (Client Invoices).
Filter Pending Invoices
- Passes through only invoices with Status = Pending.
Prepare Invoice Data
- Collects and formats details:
  - Invoice ID
  - Client Name & Address
  - Project Name
  - Amount (USD)
  - Invoice Date (today’s date)
  - Due Date (7 days later)
Loop Over Invoices
- Processes each invoice one by one.
AI Email Draft
- Uses GPT-4.1-mini to generate a polite, professional email.
- Tone: friendly but business-oriented.
- Signed as Upward Engine Team.
Extract Email Parts
- Separates subject and body from the AI output using an Information Extractor.
Generate Invoice PDF
- Uses CraftMyPDF to create a formatted invoice PDF with:
  - Company details (Upward Engine)
  - Client details
  - Invoice ID, Date, Due Date
  - Amount due
  - Footer message
Send Email to Client
- Sends invoice email via Gmail, attaching the PDF invoice.
Update Invoice Status
- Updates Google Sheets to mark the invoice as Completed.
- Saves Invoice ID, Date, Due Date, and updated status.
Loop Continuation
- Continues until all pending invoices are processed.

🔹 Tools & Integrations

Google Sheets → Stores client & invoice data
Filter Node → Selects only Pending invoices
GPT-4.1-mini (OpenAI) → Generates professional emails
Information Extractor → Separates subject & body
CraftMyPDF → Creates PDF invoices
Gmail → Sends invoice emails with PDF attachments

🔹 Example Workflow

✅ Google Sheets: Invoice marked as Pending ➡️ AI generates email → “Invoice INV-1023 for Web Design Project – Due Sep 5” ➡️ PDF invoice created & attached ➡️ Email sent to client with subject + body ➡️ Status updated in Google Sheet → Completed

⚡ This agent ensures zero missed invoices, professional client communication, and up-to-date tracking — fully automated for agencies and small businesses.

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 - When clicking ‘Execute workflow’

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

Block 2 - Google Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.6

Block 3 - Filter

Type / Role: n8n-nodes-base.filter - filter
Config choices: Version 2.2

Block 4 - Edit Fields

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

Block 5 - Loop Over Items

Type / Role: n8n-nodes-base.splitInBatches - splitInBatches
Config choices: Version 3

Block 6 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2

Block 7 - Information Extractor

Type / Role: @n8n/n8n-nodes-langchain.informationExtractor - informationExtractor
Config choices: Version 1.2

Block 8 - CraftMyPDF

Type / Role: n8n-nodes-craftmypdf.craftMyPdf - craftMyPdf
Config choices: Version 1

Block 9 - Gmail

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 10 - Google Sheets1

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.6

Block 11 - GPT - 4.1 mini

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 12 - Sticky Note

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

Block 13 - Sticky Note3

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

3. Summary Table

Workflow	AI invoice agent
Complexity	intermediate
Nodes	13
Categories	Invoice Processing, Multimodal AI
Author	Rakin Jakaria
Published	26 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7905/7905.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 Multimodal AI workflows

Frequently asked questions

What does AI invoice agent do?

AI Invoice Agent The AI Invoice Agent automates the invoice creation, email delivery, and status tracking process for client billing. It ensures invoices are generated, sent professionally, and ...

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, Multimodal AI use case.

Rakin Jakaria

11 workflows

Nodes

n8n-nodes-base.manualtrigger n8n-nodes-base.googlesheets n8n-nodes-base.filter n8n-nodes-base.set n8n-nodes-base.splitinbatches @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.informationextractor n8n-nodes-craftmypdf.craftmypdf

Complexity

intermediate

Published 26 Aug 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/7905/7905.json

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AI invoice agent

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

📄 AI Invoice Agent

🔹 How It Works

🔹 Tools & Integrations

🔹 Example Workflow

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - When clicking ‘Execute workflow’

Block 2 - Google Sheets

Block 3 - Filter

Block 4 - Edit Fields

Block 5 - Loop Over Items

Block 6 - AI Agent

Block 7 - Information Extractor

Block 8 - CraftMyPDF

Block 9 - Gmail

Block 10 - Google Sheets1

Block 11 - GPT - 4.1 mini

Block 12 - Sticky Note

Block 13 - Sticky Note3

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