Advisory invoice gate. Each supplier document is checked against the approved PO for quantity and price before you pay. Nothing is blocked; exceptions are listed with values for you to accept or challenge.

Upload intake. Drop a PO or supplier invoice file (XLSX, XLSB, CSV), pick the preset, check the preview, then download the system file. Live submission to the system arrives with the automation in step 6; until then the downloaded file is committed to GitHub by hand.

Full audit trail, newest first. Every change to any PO lives here, with its source quoted.