public CommandProcessingResult updateClientIdentifier(final Long clientId, final Long identifierId, final JsonCommand command) {
this.context.authenticatedUser();
final ClientIdentifierCommand clientIdentifierCommand = this.clientIdentifierCommandFromApiJsonDeserializer
.commandFromApiJson(command.json());
clientIdentifierCommand.validateForUpdate();
String documentTypeLabel = null;
String documentKey = null;
Long documentTypeId = clientIdentifierCommand.getDocumentTypeId();
try {