var identifier: String?
It has format {serverId}-{autoincrementId}. Where serverId - unique id of the server, autoincrementId - just +1 unique long id within the server. Both identifiers are in scale of notation with basis 32. To serialize number to the string .ALLOWED_LETTERS array used. Use com.srv4pos.server.api.infrastructure.http.HttpHelper.shortify to serialize. *