Both the UAE and Oman have built their e-invoicing on Peppol, using what is called a "five-corner" model. It sounds technical, but the idea is simple — and understanding it makes choosing a service provider much easier.
What is Peppol?
Peppol is an international network and set of standards for exchanging business documents such as invoices electronically. Instead of every company connecting to every other company, each business connects once — through an access point, or service provider — and can then exchange invoices with anyone else on the network.
It works much like email: you don't need to know which provider your customer uses; your provider finds theirs and delivers the message.
From four corners to five
The classic Peppol model has four corners: the supplier, the supplier's service provider, the buyer's service provider and the buyer. The UAE and Oman add a fifth: the tax authority, which receives tax data from the invoices as they are exchanged.
| Corner | Who | Role |
|---|---|---|
| 1 | Supplier | Creates the invoice in its ERP or billing system |
| 2 | Supplier's service provider | Validates the invoice and sends it over Peppol |
| 3 | Buyer's service provider | Receives the invoice for the buyer |
| 4 | Buyer | Receives a structured invoice in its own system |
| 5 | Tax authority (FTA / OTA) | Receives the invoice's tax data |
"Connect once, exchange with everyone — and the tax authority sees the data at the same time."
How this differs from Saudi Arabia
Saudi Arabia uses a clearance model: standard invoices go directly to ZATCA, which approves them before they can be issued. In the five-corner model used by the UAE and Oman, invoices are exchanged between service providers and the tax data is reported — the authority does not approve each invoice before it reaches the buyer.
For businesses operating in all three countries, that means one ERP may need to support two different patterns. The data is similar; the routes are different.
Choosing a service provider
In both countries you must work through an accredited service provider. When comparing options, ask:
- Accreditation — is the provider accredited by the FTA (UAE) or selectable on the Fawtara portal (Oman)?
- Integration — does it connect cleanly to your ERP, or will you need custom work?
- Validation — does it check invoices before sending and explain rejections clearly?
- Inbound invoices — can supplier invoices flow straight into your accounts payable process?
- Archiving — does it help you meet retention rules (at least five years in the UAE, ten in Oman)?
- Multi-country — if you also operate in Saudi Arabia, can the same platform handle ZATCA?
Key takeaway
The service provider handles the network; your ERP still has to produce the right data. Budget as much attention for data mapping and integration as for the provider choice itself.
Key takeaways
- The UAE and Oman both use a Peppol-based five-corner model.
- You connect once through an accredited service provider and can exchange with any business on the network.
- Saudi Arabia differs: standard invoices are cleared directly by ZATCA.
- Choose a provider on accreditation, ERP integration, validation, inbound handling and archiving.