Automate Invoice Processing with OCR, GPT-4 & Salesforce Opportunity Creation — n8n Workflow

Medium complexity⚡ Trigger11 nodes🏷️ Invoice Processing👁 4 viewsby Le Nguyen

Overview

PDF Invoice Extractor (AI)

End-to-end pipeline: Watch Drive ➜ Download PDF ➜ OCR text ➜ AI normalize to JSON ➜ Upsert Buyer (Account) ➜ Create Opportunity ➜ Map Products ➜ Create OLI via Composite API ➜ Archive to OneDrive.

Node by node (what it does & key setup)

Google Drive Trigger Purpose**: Fire when a new file appears in a specific Google Drive folder. Key settings**: Event: fileCreated Folder ID: google drive folder id Polling: everyMinute Creds: googleDriveOAuth2Api Output**

Nodes used

HTTP RequestGoogle DriveMicrosoft OneDriveSalesforceCodeOpenAI

Workflow Preview

PDF Invoice Extractor (AI) to Salesforce Oppo

What it does:

Watch a Drive folder → OCR PDF → extract invoices (JSON

1) Google Drive Trigger

- Op: fileCreated in folder (ID)

- Poll: every minute

- Creds: Google Drive OAuth2

- Note: Ensure access/Shared Drive rights

2) Download from Drive

- Op: download by {{$json.id}}

- Binary key: data (default)

- Creds: Google Drive OAuth2

3) Extract from File

- Op: pdf (enable OCR for scans)

- Output: {{$json.text}}

4) Message a Model (JSON)

- Node: @n8n/n8n-nodes-langchain.openAi

- Model: gpt-4.1 (or gpt-4.1-mini)

- Prompt: strict schema; return only JSON array

- jsonOutput: true

- Output path (first item

5) Salesforce: Upsert Account (Buyer)

- Node: salesforce (account upsert)

- External Id: tax_id__c

- externalIdValue: ={{ $json.message.content.buyer.tax_

- name: ={{ $json.message.content.buy

6) Salesforce: Create Opportunity

- Node: salesforce (resource: opportunity)

- name: ={{ $('Message a model').item.json.message.cont

- closeDate: ={{ $('Message a model').item.js

7) Code: Build SOQL (PricebookEntry)

- Node: Code (JS)

- Purpose: collect ProductCodes from LLM products → bui

- Output: { soql, codes }

8) Salesforce: Query PricebookEntries

- Node: salesforce (search)

- query: ={{ $json.soql }}

9) Code: Build OLI Payloads

- Node: Code (JS)

- Inputs:

- OpportunityId: ={{ $('Create an opportunity').first

- Lines: ={{ $('Message a model').first().json.messag

10) HTTP Request: Create Opportunity Line Ite

- Method: POST

- URL: https://<your-instance>.my.salesforce.com/servic

- Auth: salesforceOAuth2Api

- Body (JSON): ={{

11) Upload to OneDrive

- Op: upload

- Name: ={{ $json.name }}

- Parent Folder ID: (set)

- Binary: from step 2

- Creds: OneDrive OAuth2

Extract from File

⚡

Google Drive Trigger

Message a model

Download File From Google

Update File to One Drive

Create an opportunity

Create or update an acco…

Build SOQL

Query PricebookEntries

Code in JavaScript

Create Opportunity Line …

11 nodes10 edges

How it Works

1
Trigger
The workflow starts with a trigger trigger.
2
Process
Data flows through 11 nodes, connecting code, extractfromfile, googledrive.
3
Output
The workflow completes its automation and delivers the result to the configured destination.

Node Details (11)

HTTP Request

httpRequest

Google Drive

googleDrive

Microsoft OneDrive

microsoftOneDrive

Salesforce

salesforce

Code

code

OpenAI

n8n-nodes-langchain.openAi

How to Import This Workflow

1Click Download JSON button on the right to save the workflow file.
2Open your n8n instance. Go to Workflows → New → Import from file.
3Select the downloaded automate-invoice-processing-with-ocr-gpt-4-salesforce-opportunity-creation file and click Import.
4Set up credentials for each service node (API keys, OAuth, etc.).
5Click Test Workflow to verify everything works, then activate it.

Or paste directly in n8n → Import from JSON:

{ "name": "Automate Invoice Processing with OCR, GPT-4 & Salesforce Opportunity Creation", "nodes": [...], ...}

Integrations

codeextractfromfilegoogledrivegoogledrivetriggerhttprequestmicrosoftonedriveopenaisalesforce

Get This Workflow

Download and import in one click

Download JSON View on n8n.io

Nodes11

Complexitymedium

Triggertrigger

CategoryInvoice Processing

Created by

Le Nguyen

@leeseifer

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🔗 Webhook·12 nodes