English version

bona fides

From Longman Dictionary of Contemporary Englishbona fidesbona fi‧des /ˌbəʊnə ˈfaɪdiːz $ ˌboʊnə-, ˈboʊnə faɪdz/ noun [plural] British English  if you check someone’s bona fides, you check that they are who they say they are, and that their intentions are good and honest
Examples from the Corpus
bona fidesWith travel and entertainment expenses, the bona fides of the expense may not be so readily apparent.
From Longman Business Dictionarybona fidesbona fi‧des /ˌbəʊnə ˈfaɪdɪzˌboʊnə ˈfaɪdiz, -ˈfaɪdz/ noun [plural] LAW if you check someone’s bona fides, you make sure they are the person they say they are or that what they say is true
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