digraph registration {
	rankdir="LR";

	start[shape=circle label=Start];

	saved[shape=box label=Saved];
	invoice[shape=box label="Invoice generated"];
	paid[shape=box label="Invoice paid"];
	done[shape=box label=Completed];

	start -> saved [label = "Details saved"];
	saved -> invoice [label = "Invoice generated"];
	invoice -> paid [label = "Payment"];
	paid -> done;

	saved -> saved [label = "Edit" ];
	invoice -> saved [label = "Invoice expired or canceled"];
	saved -> done [label = "No payment required"];
}