B2B integration is the automated exchange of data between the IT systems of trading partners — no manual entry, no email attachments, no retyping from PDFs. The goal is for a purchase order issued in your ERP to land directly in the supplier's ERP, and for their invoice to post into yours without human intervention.
This article explains what makes a B2B integration, how it differs from B2C, typical use cases, the technology stack and the realistic ROI you can expect.
Difference between B2B and B2C integration
B2C integration is end-user facing — web shop, mobile app, customer portal. UI is key, latency must be low, transaction volumes are large but individual amounts small.
B2B integration is system-to-system — no UI between the two systems. The priorities are structured schema compliance, semantic validation, guaranteed delivery and an audit trail. Volumes are typically lower than B2C, but individual transaction values significantly higher.
Typical use cases
- Purchase order flow — buyer issues a PO, supplier confirms, possibly corrects.
- Advance shipping notice (ASN) flow — before physical delivery the supplier sends a structured notice of pack content (DESADV message).
- Invoice flow — supplier issues a structured invoice (UBL, EDIFACT INVOIC, Peppol BIS), buyer posts it automatically.
- Master data sync — synchronisation of article, partner and price catalogues between trading partners.
- Status and tracking — real-time queries about order status, stock availability, delivery time.
Technology stack
Three main technical approaches: EDI (structured documents — EDIFACT D96A, UBL 2.1, ANSI X12), APIs (REST, GraphQL — for real-time calls) and file-drop (sFTP, AS2 — for asynchronous file transfer). In practice they are combined: EDI for documents that must be legally valid and auditable, API for real-time queries and status checks.
Above those protocols sits the network layer — the Peppol network for European public procurement and increasingly B2B, GS1 EANCOM for retail and FMCG, and local national networks such as Croatia's CIS (for fiscalisation).
Realistic ROI
Based on data from REDOK projects over the last 10 years, a mid-sized company moving from manual processes to B2B integration sees a 60–80 % reduction in administrative time (accounting, procurement, logistics), a 95 %+ touchless processing rate (share of transactions handled without human intervention) and ROI payback within 6–12 months.
On top of that, a good B2B integration cuts disputes by 60 % and speeds up the collection cycle by 3–7 days — releasing significant working capital.
EDI vs API — which to choose
EDI is still the most common technology in the B2B segment because it has legal and regulatory coverage (e-invoicing, Peppol, fiscalisation). APIs are growing — especially for real-time use cases and younger companies without legacy. In most real setups the two coexist: EDI for the document of record, API for status and master data.
Summary
B2B integration is the infrastructure of modern business — like the electrical grid during the industrial revolution. Companies that are integrated play at a different pace from those still relying on PDF and email.
If you are considering B2B integration or modernising existing processes, the REDOK team offers a free maturity assessment — a review of current processes and a short report of priority steps. Reach out through the contact form.