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File-Based Integration: Exchanging Files over SFTP and FTP, Watching Folders, Idempotent Processing and Reconciliation

In a file-based integration you read a file only once the other side has marked it ready (a .done marker, or upload under a temporary name and rename), verify the host key, and record processed files in a ledger by content hash, so nothing is processed half-written or twice. In Bookstore we fetch the supplier's stock file over SFTP with SSH.NET and the bank's collections file over FTPS with FluentFTP, and reconcile it against orders.