Exports
A project's files in any of the app's formats (PDF report, CSV, GeoJSON, KML, GPX, DXF, TXT, .mmp) and its estimate, made by the same code as the app's Export, so a file your software fetches is the file the app would make. See Exports and estimates.
Prices need Products: read on the key: without it a report leaves its prices out, and an estimate is refused.