Dumplie\CustomerService\Application\Command\RejectPayment::paymentId PHP Method

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

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