E-invoices over Peppol and e-SLOG for the public sector and B2B

Send e-invoices through the Peppol network, including to UJP and public-sector buyers, or download the e-SLOG file and UJP package to upload yourself in the UJP portal. From January 2028, under the new law, e-invoices also become mandatory between businesses in Slovenia.

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What are e-invoices?

E-invoices are structured electronic documents that software can process without manual data entry. Slovenian businesses can send e-invoices over the Peppol network, including to UJP and public-sector buyers, or use the national e-SLOG 2.0 standard and submit the UJP package themselves.

Benefits of e-invoicing

Faster payment — on average 8 days faster than paper invoices

Fewer errors — no manual data transcription

Lower costs — save on printing, postage, and archiving

Eco-friendly — no paper, no waste

Legal compliance — meet e-invoicing requirements for public procurement

How it works in Apollo

1

Create an invoice as usual

2

Choose to send over Peppol, or to download the e-SLOG file / UJP package

3

Apollo sends it through the Peppol network, or gives you a checked e-SLOG 2.0 file and UJP package to upload to the UJP portal yourself

How to prepare the e-SLOG file and UJP package

Supported standards

e-SLOG 2.0 — Slovenian national e-invoice standard (Slovenian businesses)

UBL 2.1 — Universal Business Language for international exchange

PEPPOL — European e-invoicing network, including UJP and public-sector buyers

Stop losing time to invoicing admin

Apollo helps Slovenia-based businesses invoice faster and stay compliant.

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