Currently, DATEV Unternehmen Online (DUO) does not support the automatic retrieval of suppliers.
You can work around this limitation and share your supplier data between Payhawk and DUO by mapping that supplier through its Payhawk External ID field.
Payhawk will not automatically update previously classified expenses. For example, if you have Amazon as a supplier and you update its External ID field in Payhawk so that it corresponds to its supplier code in DATEV, none of the previous Amazon expenses will be automatically updated.
Mapping supplier data between Payhawk and DUO
To map a supplier between Payhawk and DUO:
Log in to your Payhawk account.
Go to Suppliers.
Choose a supplier you want to map.
Set the supplier's External ID to the corresponding supplier code in DUO.
Mapping suppliers in bulk
To map your suppliers between Payhawk and DUO in bulk, see the article on importing and exporting suppliers in Payhawk.