Automate Invoice PDF Extraction with OpenAI & Google Sheets

Automate Invoice PDF Extraction with OpenAI & Google Sheets

Unlock the potential of seamless invoice management by automating your PDF extraction process with our cutting-edge n8n workflow. This solution effortlessly extracts invoice data using OpenAI and organizes it neatly into Google Sheets, providing you with structured insights and error-free records at your fingertips.

What this workflow does

• Invoice Collection: Start by receiving an invoice through an n8n Form. The form captures essential details like the submitter’s name, email, currency, notes, and the PDF file of the invoice.
• Text Extraction: Extract all text content from the uploaded PDF efficiently.
• Data Structuring: Utilize OpenAI's Chat Completions to transform the text into a structured JSON object, detailing invoice fields and line items.
• Data Validation: Thoroughly parse the JSON data against essential metadata, halting the process if any key fields (e.g., invoice number or line items) are missing.
• Google Sheets Integration: Append the invoice header details to the 'Invoices' tab and split the line items for insertion into the 'Line Items' tab, all in Google Sheets.
• Total Verification & Report Generation: Aggregate line items, check that summed totals match the invoice total, and generate an HTML report emailed to the submitter through Gmail.

Use cases

• Accounting Teams: Save time and reduce human error in processing and logging numerous invoices by automating data extraction and validation.
• SaaS Subscription Services: Automate billing processes, ensuring accurate tracking and record-keeping effectively.
• Freelancers: Streamline the invoicing workflow to keep precise and organized financial records effortlessly.

Technical details

• Nodes Used: n8n form trigger, OpenAI for Chat Completions, Google Sheets for record-keeping, and Gmail for report sending.
• Configuration Requirements: Set up OpenAI API credentials and configure Google Sheets OAuth2 credentials with the necessary access.
• Google Sheets Setup: Ensure two tabs named 'Invoices' and 'Line Items' are prepared with the expected columns before initiating the workflow.

Enhance your productivity by integrating this workflow that marries the AI capabilities of OpenAI with the organizational power of Google Sheets.