Automate Invoice Processing with OCR.Space, GPT-4 & Google Drive to Gmail

# How it works - Watches a Google Drive folder for new (scanned) invoices. Each new file automatically triggers the workflow. - Downloads and processes each invoice through OCR Space to extract the text. - Extracts the company name (e.g., from the "billed to" field) and uses an AI agent to cross-reference it against a database in Google Sheets. - If a match is found, retrieves the correct recipient email and sends the invoice as an attachment. - If no match or an error occurs, the workflow alerts an operator by email for manual review. ## Setting up the workflow 1. **Connect Google Drive** In n8n, connect your Google Drive account. Create or select a folder where you will upload scanned invoices. 2. **Connect Gmail (or another email service)** Add your Gmail account as a credential in n8n. This will be used to send the processed invoice to the correct recipient. 3. **Set up OCR.Space** Create a free OCR.Space account: https://ocr.space In n8n, create a Generic Credential (Header Auth). Use `apikey` as the name and your OCR API key as the value. 4. **Connect the AI Agent** Add your OpenAI API key as a credential in n8n. The AI Agent will extract the company name from the invoice text and match it against your database. If a match is found, it retrieves the correct email. 5. **Prepare the Google Sheet database** Make a copy of the database sheet: Google Sheet Template Fill it with company names and recipient emails. Connect your Google account to n8n and link this sheet to the workflow. 6. **Run the workflow** When a new invoice is uploaded to your Google Drive folder, the workflow will: - Extract the text with OCR.Space - Use the AI Agent to identify the company name - Cross-reference it with your Google Sheet database - Send the invoice automatically to the correct recipient via Gmail If no match is found, an error email is sent to you for manual review.