// DefaultKeyID is the key ID used when
	// no explicit key ID is specified for
	// a cryptographic operation.
	DefaultKeyID string

	// APIKey is an credential provided by env. var.
	// to authenticate to a KES server. Either an
	// API key or a client certificate must be specified.
	APIKey kes.APIKey

	// Certificate is the client TLS certificate
	// to authenticate to KMS via mTLS.
	Certificate *certs.Certificate