Update Credential
PUT {{_endpoint}}/services/data/v{{version}}/named-credentials/credential
Update a credential.
Request Body
{"externalCredential"=>"test", "authenticationProtocol"=>"Custom", "principalName"=>"test", "principalType"=>"NamedPrincipal", "credentials"=>{"testCredential"=>{"value"=>"000000", "encrypted"=>true}}}