Invoice Verification and Validation with Gmail, Drive, Sheets and OCR AI β€” n8n Workflow

High complexity⏰ Scheduled34 nodes🏷️ Invoice ProcessingπŸ‘ 330 viewsby Dhrumil Patel

Overview

πŸ“ Description (Full, User-Centric & Sales-Driven):

Tired of manually verifying purchase order invoices every single day? This plug-and-play n8n automation template saves your accounts team hours of work by automatically downloading, storing, extracting, and validating invoice data against your master item sheet β€” all without human intervention.

Perfect for SMEs, startups, procurement teams, and accounts departments, this automation handles PO invoice verification from email to final validation

Nodes used

Google SheetsGoogle DriveGmailCodeAI AgentOpenRouter Chat Model

Workflow Preview

model
E
Extract from File
OpenRouter Chat Model
S
Split Out
Post-Processing
Text Extractor
I
If
S
Send Raw Text Again
L
Loop Over Items
Send Invoice Data
Fetch Master Data
Update Results
W
Wait
Update Totals
Get last Index
G
Generate Unique Key
Validation
Upload Invoices
Get Attachments
M
Merge
Create Month Folder
Create Day Folder
Search Month Folder
M
Month Folder Found?
Search Day Folder
D
Day Folder Found?
Get Parent Folder ID
Get Day Folder ID
Today's Date
D
Date & Time
Read Message
Date From Email Subject
Gmail Trigger
⚑
S
Schedule Trigger
Notify
34 nodes38 edges

How it Works

  1. 1

    Trigger

    The workflow starts with a scheduled trigger, running on a defined schedule.

  2. 2

    Process

    Data flows through 34 nodes, connecting agent, code, datetime.

  3. 3

    Output

    The workflow completes its automation and delivers the result to the configured destination.

Node Details (34)

GO

Google Sheets

googleSheets

#1
GO

Google Drive

googleDrive

#2
GM

Gmail

gmail

#3
CO

Code

code

#4
AI

AI Agent

n8n-nodes-langchain.agent

#5
OP

OpenRouter Chat Model

n8n-nodes-langchain.lmChatOpenRouter

#6

How to Import This Workflow

  1. 1Click Download JSON button on the right to save the workflow file.
  2. 2Open your n8n instance. Go to Workflows β†’ New β†’ Import from file.
  3. 3Select the downloaded invoice-verification-and-validation-with-gmail-drive-sheets-and-ocr-ai file and click Import.
  4. 4Set up credentials for each service node (API keys, OAuth, etc.).
  5. 5Click Test Workflow to verify everything works, then activate it.

Or paste directly in n8n β†’ Import from JSON:

{ "name": "Invoice Verification and Validation with Gmail, Drive, Sheets and OCR AI", "nodes": [...], ...}

Integrations

agentcodedatetimeextractfromfilegmailgoogledrivegooglesheetsiflmchatopenroutermergescheduletriggersetsplitinbatchessplitoutwait

Get This Workflow

Download and import in one click

Download JSONView on n8n.io
Nodes34
Complexityhigh
Triggerscheduled
Views330
CategoryInvoice Processing

Created by

Dhrumil Patel

Dhrumil Patel

@itechdp

Tags

agentcodedatetimeextractfromfilegmailgoogledrivegooglesheetsiflmchatopenroutermerge
⚑

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Automate Custom QuickBooks Invoice PDFs & Email with n8n

Standard accounting templates often fail to reflect a premium brand identity. This sophisticated n8n workflow bridges the gap between financial record-keeping and professional client presentation. By moving beyond the native limitations of QuickBooks Online, this automation enables businesses to generate high-end, multi-page PDF invoices that align perfectly with their corporate styling. The process begins the moment a new invoice is generated in QuickBooks, triggering a webhook that captures real-time billing data. The workflow then utilizes advanced HTML-to-File conversion and custom Code nodes to structure data into a polished, branded layout. It handles complex logic such as line-item merging and multi-page formatting automatically. Once the document is rendered, the system bypasses generic 'no-reply' senders by routing the finalized PDF through your preferred email provider. This ensures a seamless, white-labeled experience for your clients while eliminating the manual overhead of exporting, styling, and attaching files. Ideal for agencies and service providers, this flow guarantees that your most frequent touchpointβ€”the billβ€”is as professional as your work. **Common Use Cases:** - High-end creative agencies requiring bespoke, white-labeled billing documents for premium clients. - Automated recurring subscription billing where custom tax disclosures or localized branding are required. - Service-based businesses needing to attach dynamic project reports or terms of service directly to QuickBooks invoices.

πŸ”— WebhookΒ·12 nodes