Build a GST Invoice PDF Extractor in 53 Lines of Python

If you run a small business in India, you've felt this pain: a folder full of PDF invoices from different vendors, every one formatted slightly differently, and somebody has to type GSTIN, invoice number, date, and total amount into a spreadsheet. I built a single-file Python script that processes the whole folder in seconds and validates GSTINs along the way. Total: 53 lines including imports and CLI plumbing. Here's the whole thing. What it does Walks a folder of PDF invoices Pulls out GSTINs