Federal invoice submission portals are central access points for the submission of e-invoices. Organisations of the direct federal administration (e.g. ministries and superior federal authorities) receive e-invoices via the Federal Central Invoice Submission Portal (ZRE). Organisations of the indirect federal administration and cooperating federal states may receive e-invoices via the Online Access Act-compliant Invoice Submission Portal (OZG-RE), provided they are connected to it.