Fiscalization in Spain: How should SIF (POS) be identified?

Under Royal Decree 1007/2023, Spain defines a Sistema Informático de Facturación (SIF) as an autonomous and independent invoicing system that issues invoices with tax QR codes while also managing or directing the creation, sending, and storage of billing records (RF). A SIF is uniquely identified by a combination of three elements: the operator’s NIF (OEF ID), a two-character SIF ID assigned by the software manufacturer, and the installation number.