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# OIO UBL integration overview

> Companies need to send sales invoices, credit memos, finance charge memos, and reminders to the Danish public sector electronically in the Offentlig Information Online UBL (OIOUBL) format.

This is done using the [<ins>Offentlig Information Online UBL</ins>](https://www.oioubl.info/classes/en/index.html) (OIOUBL) format. If a company does not send these documents electronically, the authorities are entitled to deny the payment.