UserKeySigningParameters
data class UserKeySigningParameters(val context: Context, val algorithm: String, val userKey: UserKey, val privateKey: PrivateKey, val signature: Signature?, val challenge: String, val issueTime: Instant, val notBeforeTime: Instant, val expiration: Instant, val customClaims: Map<String, Any> = emptyMap())
Parameters required for signing a JWT using a UserKey with custom claims support.