Dumplie\CustomerService\Application\Command\PayPayment::paymentId PHP 메소드

    public function paymentId() : string
    {
        return $this->paymentId;
    }

 /**
  * @param PayPayment $command
  * @throws InvalidTransitionException
  */
 public function handle(PayPayment $command)
 {
     $payment = $this->payments->getById(new PaymentId($command->paymentId()));
     $payment->pay();
 }