payment.puml

@startuml
left to right direction
state "payment" as payment {
  [*] --> payment.method

  state "method" as payment.method {
    [*] --> payment.method.cash

    payment.method --> payment.review : NEXT
    state "cash" as payment.method.cash {
      payment.method.cash --> payment.method.check : SWITCH_CHECK
    }

    state "check" as payment.method.check {
      payment.method.check --> payment.method.cash : SWITCH_CASH
    }

    state "hist" as payment.method.hist {
    }
  }

  state "review" as payment.review {
    payment.review --> payment.method.hist : PREVIOUS
  }
}
@enduml