Files.com delivers payment files to every bank and processor encrypted with that counterparty’s key, on its cadence, from addresses it can whitelist, and brings the acknowledgements, settlement reports, and statements back before reconciliation starts. Treasury and accounts payable run every bank from one place.
Each bank dictates its own terms: SFTP, PGP under its key, a static IP, a daily cutoff. Today those terms are met by a person at a portal, a script per bank, or a server someone patches so that banks can connect to it.