API: Call one field
api.php?type=field&field=#&filtervalue=#
API: Call one field with extended filter
api.php?type=fieldext&field=#&filter=#&filtervalue=#
API: Call all fields with extended filter as JSON
api.php?type=fieldext&field=#&filter=#&filtervalue=#
API: URL-Generator
api.php?type=url&url=#
API: Prüfe auf Inhalt in Leistungsbeschreibungen
proof.php?a=#