It will verify the credentials of any service people who come by.
Dean ordered a cup and showed her his credentials, but she hardly glanced at them.
Accordingly, the credentials must also be constituents of the revelation.
In February 1792, at his own mortal peril, he once more succeeded in reaching Paris with counterfeit credentials as minister plenipotentiary to Portugal.
When you make an appointment to see someone, don't be afraid to ask for proof of credentials.