I've been exploring invoice processing and accounting automation workflows recently, and one thing stands out: extracting data from invoices sounds simple until you encounter real-world documents.

Challenges I've seen include:

• Different invoice layouts

• Poor scan quality

• Multi-page invoices

• Handwritten notes

• Missing or inconsistent fields

• Multiple languages and currencies

For developers working with OCR or document AI:

• What has been your biggest challenge with invoice extraction?

• Are traditional OCR engines enough, or are you using AI/LLM-based approaches?

• How do you validate extracted data before sending it into accounting systems?

Interested in hearing about real-world experiences, tools, and lessons learned from production environments.