Carter cited his Southern roots as a credential for recognizing—and talking about—racism.
The credential of having a lot of Washington, D.C., experience is not “a calling card” among voters any more.
Susskind did not have a credential to park at the United Nations.
"that which entitles to credit," 1756, probably a back-formation from credentials. Earlier in English as an adjective, "confirming, corroborating" (late 15c.). As a verb, "provide with credentials," by 1828 (implied in dredentialed).