Contributors verify a business email, confirm they may share the document, and upload an invoice sent or received at work as the original file; photographed screens, material under NDA and blank templates are refused. Eligibility is limited to the US, Canada, the UK, Europe, Australia and New Zealand, up to 50 invoices per contributor, so the set spans VAT, GST and sales-tax regimes and several currencies. Native text layer where the system produced one. Commercial invoices are locked inside accounting systems, and the open corpora are largely synthetic renders or research-gated (DocILE); real accounts-payable documents carry the mess synthetic ones lack: odd line descriptions, partial shipments, mixed tax rates, credit notes.