When listing vouchers on an organisation it is possible to search for keywords and get vouchers containing these specific keywords. 
For an example you can search for keyword "VAT" on any organisation and get X amount of vouchers containing the word "VAT". 

It is a criterion that the keyword appears on a field that the respective organisation has activated to be lifted as the keywords will be found by the scanned fields. 

See endpoint here https://api.bilagscan.dk/docs#operation/GetOrganizationVouchers.