What is the four-corner model in electronic invoice exchange?
The four-corner model is the technical architecture used by the Peppol network for document exchange. Corner 1 is the sender's ERP or billing system; Corner 2 is the sender's Access Point; Corner 3 is the receiver's Access Point; Corner 4 is the receiver's ERP or system. Invoices travel from Corner 1 to Corner 2 (sender's internal network), then from Corner 2 to Corner 3 via the Peppol network, then from Corner 3 to Corner 4 (receiver's internal network).
What are the advantages of the four-corner network model?
The four-corner model provides several advantages: (1) Interoperability without bilateral agreements - any Peppol-connected business can exchange documents with any other, without pre-arranged connectivity; (2) Competitive access point market - businesses choose their AP independently from their trading partners; (3) Security - each access point authenticates the other; (4) Auditability - document delivery is confirmed at each corner; (5) Scalability - new participants add themselves; (6) Jurisdiction independence - works across countries in the Peppol network.
Frequently Asked Questions
- What is the five-corner model used in UAE e-invoicing?
- The five-corner model extends the standard Peppol four-corner model by inserting a fifth corner: the tax authority platform (FTA in the UAE). Corner 1 = seller ERP, Corner 2 = seller ASP (accredited service provider), Corner 3 = FTA platform (clearance and validation), Corner 4 = buyer ASP, Corner 5 = buyer ERP. The FTA sits between the two access points and provides clearance of invoices before they reach the buyer, enabling a CTC model on top of the Peppol infrastructure.
- How does the four-corner model differ from EDI bilateral exchange?
- Traditional EDI exchange requires bilateral agreements between each pair of trading partners; connecting to 100 suppliers requires 100 separate agreements, technical setups, and formats. The four-corner model provides universal connectivity: any Peppol participant can exchange documents with any other without bilateral setup. Businesses register once with an access point and can immediately exchange documents with all other Peppol participants globally through the network's SMP (Service Metadata Publisher) discovery mechanism.