A web service allows direct transmission of data between electronic systems such as ERP systems, that is, between a generating system and a receiving system. This enables the user to generate and send invoices on the same system, at the touch of the button. A free web service is provided for the ZRE and OZG-RE submission portals. It transmits e-invoices to those portals via Peppol. Please contact Peppol.Support@nortal.com for information on how to connect to the web service.