id() :: pos_integer()

t() :: %ExFtx.Order{
  client_id: ExFtx.OrderPayload.client_id(),
  created_at: String.t(),
  filled_size: number(),
  future: String.t(),
  id: id(),
  ioc: boolean(),
  market: ExFtx.Market.name(),
  post_only: boolean(),
  price: number(),
  reduce_only: boolean(),
  remaining_size: number(),
  side: String.t(),
  size: number(),
  status: String.t(),
  type: String.t()
}