What does a corner mean in the PEPPOL model?
The PEPPOL network describes each participant in a transaction as a corner. The model gets its name from how many participants are involved in the exchange.
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How PEPPOL Actually Routes an Invoice. Explained Plainly
24 July 2026
You keep hearing about PEPPOL and the 5-corner model. Here’s what it actually means in practice, in plain language.
PEPPOL is mentioned constantly in e-invoicing discussions. Most explanations of how it works are either too technical to be useful or too vague to mean anything. Here’s a practical version that doesn’t require an IT background.
How does a 4-corner exchange work?
Corner 1 is the supplier.
Corner 2 is the supplier's access point, which is a certified service provider connected to the PEPPOL network.
Corner 3 is the buyer's access point.
Corner 4 is the buyer.
The supplier sends an invoice to their access point, which routes it to the buyer's access point using a shared standard. The buyer's access point delivers it into their system. Corners 2 and 3 handle all the technical work. The supplier and buyer just send and receive.
Why is there a 5-corner model?
The 5-corner model adds a fifth participant: the tax authority.
In countries with real-time reporting requirements, the access point also sends a copy of the relevant invoice data to a central government platform at the moment of exchange. The commercial transaction and the tax report happen at the same time. No separate filing needed.
Why is the 5-corner model spreading globally?
Because it works for both sides. Governments get real-time visibility into transactions. Businesses get automation benefits from structured data exchange. France and the UAE are building their mandates on this model. It’s expected to become the standard across most major economies by 2030.
What is a PEPPOL access point?
An access point is a certified service provider that connects a business to the PEPPOL network. They handle the technical formatting, routing, security and delivery on behalf of their customers. Businesses don’t connect directly to each other: each side connects to their own access point, and the access points communicate.
How does Unimaze fit into this?
Unimaze Dispatcher is the access point in this model, the certified PEPPOL connection sitting at corner 2 or corner 3 depending on which side of the trade you’re on.
For outbound invoices, Dispatcher looks up the recipient’s registered PEPPOL address, formats the invoice to the standard and delivers it. You don’t manage that lookup yourself, and nothing new is required when you start trading with a partner you haven’t sent to before.
For inbound invoices, Dispatcher receives them and routes them straight into your approval and accounting workflow, so an invoice can move from arrival to sign-off without anyone re-keying it.
Dispatcher isn’t limited to PEPPOL, either. It also delivers over AS2, FTP and email, and can submit directly to government portals where that’s required. That’s the fifth corner from the section above, handled through the same connection as the commercial exchange, with delivery status you can track for every invoice you send or receive.
