Build the export from a set of invoices.
One XML file per invoice, plus a manifest recording what was selected and the SHA-256 of every file, so the export can later be shown to be the one that was produced.
Build the export from a set of invoices.
One XML file per invoice, plus a manifest recording what was selected and the SHA-256 of every file, so the export can later be shown to be the one that was produced.