A B2B data transfer is any file that moves between two businesses rather than between a person and a website. A supplier sends an invoice to a retailer. A clinic sends claims to an insurer. A bank receives a nightly batch of loan records from a partner. The "B2B" part — business-to-business — just means both ends are companies, and the files usually arrive on a schedule, in a fixed format, with money or compliance riding on whether they show up correctly.

These transfers are the quiet plumbing behind most of commerce. You don't see them, but if they stop, purchase orders don't get filled, claims don't get paid, and shipments sit on a dock. That is why companies treat B2B data transfers as production infrastructure, not a convenience.

This post explains what B2B data transfers are, the formats and protocols involved, where they go wrong, and what it takes to run them reliably as the number of partners grows.

What Counts as a B2B Data Transfer

The defining trait is that both sides are organizations with their own systems, their own rules, and no shared login. Some common shapes:

• Inbound submissions. An outside party sends you files — a vendor uploads invoices, a lab sends test results, a borrower submits a loan application. You receive and process them.
• Outbound deliveries. You send files out — a payroll file to a bank, a shipping manifest to a carrier, a report to a regulator.
• Two-way exchanges. You and a partner trade files back and forth on a recurring basis, like a retailer and a supplier swapping orders and confirmations every day.

In every case the hard part is the same: two separate companies have to agree on how the file is formatted, how it's sent, who's allowed to send it, and what happens when it arrives.

The Formats: EDI, Flat Files, and APIs

A B2B transfer isn't just a file moving — it's a file moving in a shape both companies have agreed on ahead of time. Three formats cover most of it.

EDI (Electronic Data Interchange) is a decades-old standard for structuring business documents so a computer on the other end can read them without a human. An EDI purchase order is a plain-text file laid out in a strict, agreed format — every field in a fixed position — so the retailer's system and the supplier's system both know exactly which characters mean "quantity" and which mean "ship-to address." EDI is still everywhere in retail, manufacturing, logistics, and healthcare because the big trading networks standardized on it long ago and it works.

Flat files are the simpler cousin: a CSV, a fixed-width text file, or a spreadsheet export that the receiving system knows how to parse. A nightly file of transactions or a batch of records is often just a flat file dropped on a server.

APIs are the modern alternative — instead of dropping a file, one system calls another directly over the web and hands over the data in real time. APIs are great when both sides are modern cloud platforms, but plenty of partners still can't or won't expose one, so file-based exchange remains the lowest common denominator that everyone supports.

The Protocols: How the File Actually Moves

The format is the shape of the data. The protocol is the truck that carries it. The common ones in B2B:

• SFTP and FTPS — secure versions of the old FTP file-transfer protocol, where one side logs into a server and uploads or downloads files over an encrypted connection. This is the workhorse of B2B file exchange; most trading partners can speak it.
• AS2 (Applicability Statement 2) is a protocol designed specifically for sending business documents (often EDI) securely over the internet, with built-in encryption and a signed receipt — called an MDN — that proves the other side actually received the file. Walmart and many large retailers require AS2, which is why it shows up constantly in retail supply chains.
• HTTPS and REST APIs — the same secure web protocol your browser uses, increasingly used for B2B exchange between modern systems.

A single company often has to speak all of these at once, because each partner picks the one their own systems support. The retailer wants AS2, the carrier wants SFTP, the new SaaS vendor wants an API — and you have to accommodate all three.

Where B2B Data Transfers Go Wrong

Moving one file between two companies is easy. Doing it reliably across dozens or hundreds of partners, every day, under compliance rules, is where it gets hard. The recurring failure points:

• No proof of delivery. A file gets sent and nobody knows whether it arrived. When a partner says "we never got the order," there's no record to settle the argument. (This is exactly the problem AS2's signed receipt solves.)
• Security gaps. Plain FTP sends files and passwords in the clear. Sensitive records — patient data, financial records, contracts — moving unencrypted is a breach waiting to happen. For a closer look at the specific ways these exchanges fail, see the hidden risks in B2B file exchange.
• No audit trail. When an auditor asks who sent what, when, and to whom, a bare server can't answer. An audit log that records every upload, download, and login is the difference between passing an audit and scrambling through it.
• Manual handoffs. A person has to log in, grab the file, run it through a system, and confirm it landed. Multiply that by hundreds of daily transfers and something gets missed.
• Onboarding drag. Every new partner means new credentials, new folders, new security rules. Done by hand, adding a partner takes days and each one is set up slightly differently.

Each of these is survivable on its own. Together, across a growing partner network, they're why companies eventually stop hand-running B2B transfers and move to a platform built for it. For a fuller comparison of the options, see this guide to understanding B2B file transfer solutions.

What a Reliable B2B Transfer Setup Looks Like

Teams that run B2B transfers well share a few habits, regardless of which tools they use:

• Encrypt everything in transit. Use SFTP, FTPS, AS2, or HTTPS — never plain FTP — so files and credentials are never readable on the wire.
• Automate the handoff. A file arriving from a partner should trigger the next step on its own — route it, transform it, deliver it to the backend system — with no human clicking through.
• Log every transfer. Record who sent what, when, and whether it arrived, so an audit or a dispute has an answer.
• Standardize partner onboarding. Set up every new partner the same way — same security baseline, same folder structure, same monitoring — so the hundredth partner is as clean as the first.
• Speak every protocol. Meet each partner where they are instead of forcing them onto yours, because you usually can't dictate terms to a partner ten times your size.

Running B2B Transfers on a Modern Platform

Most teams that outgrow hand-running B2B transfers move to a single managed file transfer platform that does the whole job in one place. Files.com is the cloud-native File Orchestration Platform: one platform that replaces the stack of legacy tools IT teams run to move files — SFTP and FTP servers, MFT suites, file-sharing apps, and the custom scripts holding them together. It speaks every protocol a partner might ask for, connects 50+ cloud and on-prem systems, automates every transfer, and keeps a complete audit trail of who moved what.

For the B2B case specifically, that means a partner can send you files over SFTP, FTPS, or AS2 and EDI — including the signed receipts that prove an EDI document was delivered — and the file arriving can kick off an automated workflow on its own: route it, transform it, hand it to the system that consumes it. Spinning up a new trading partner is a repeatable setup rather than a days-long project, so partner onboarding stays clean as the network grows, and every exchange is encrypted and logged for compliance (SOC 2 Type II and HIPAA).

To see it in practice, explore managed file transfer on Files.com or start a free trial — no credit card, live in minutes.