Some systems, especially older POS and ERP installations, cannot call APIs but can export files. Flat-file feeds close that gap: catalogue and stock as scheduled CSV exports, orders as structured files back, exchanged over SFTP.
File-based sync is less immediate than an API connection, so SKUU applies wider safety margins to file-fed availability to keep the network honest. It is a pragmatic on-ramp: many shops start on files and move to the API when their stack allows. In development.