digraph OrderLifecycle {
    Confirmed -> Payed;
    Confirmed -> Delivered;
    Confirmed -> Cancelled;
    Payed -> Delivered;
    Payed -> RequireRefund;
    RequireRefund -> Refunded;

  Confirmed [shape=diamond];
  Delivered [shape=box];
  Cancelled [shape=box];
  Refunded [shape = box];
}