When sending via Peppol

Make sure that your customer is on Peppol.
- How to verify : https://docs.billit.be/docs/how-do-i-know-who-is-a-peppol-receiver
- Keep in mind the identifiers for Germany: https://docs.billit.be/docs/identfiers
The customer might have registered specific formats and versions as supported document types.
- Most common will we Xrechnung variants and maybe standard Peppol and CII formats
- You do not have to specify it
- Billit will convert to an allowed format when supported by Billit.