You can specify one or more languages on the PreferredLanguage property. Use the three-letter ISO 639 code associated with each language that you specify. Use a comma to separate the countries. Address Verification tries to return an address in the most-preferred language based on the order that you specify in the input list. If the first language that you specified is not present in the reference data, Address Verification tries to return the address in the next language in the list.
For example, when you submit NLD, FRA, and DEU as the list of preferred languages, Address Verification returns the address in Flemish. If the reference data does not contain the address in Flemish, Address Verification returns the address in French if available.