Readonlyin: "bearer"Authorization: Bearer <key>.
Readonlyin: "header"A request header carrying the key.
Readonlyname: stringHeader name.
Readonlyin: "query"A query parameter carrying the key.
Readonlyname: stringParameter name.
Readonlyin: "cookie"A cookie carrying a session or key.
Readonlyname: stringCookie name.
One way a caller can present a credential.