Invoice Data Recognition

What about the costs of shipping, freight (which is different from shipping in our accounting system), and discounts? Those all affect the final invoice amount. John6666 gives good advice as I tried to extract text from 500+ invoices in a single PDF file. It didn’t go well. I would be looking for text like “invoice number \d{4,6}” where the invoice number was 4-6 digits in a row, but the OCR software would often not extract this data in the same order. So it would not find the invoice number, and many other data. But I did that with free OCR software and not with AI designed to do OCR.