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    {

        $payment              = $event->payment;

        $registrationOptional = $this->registrationRepo->findByUuid($payment->getPayload()->get('item_number'));

        if ($registrationOptional->isEmpty()) {

            Option::fromValue($this->logger)->map(function (LoggerInterface $logger) use ($payment) {

                $logger->alert(sprintf('No registration found with uuid "%s"', $payment->getPayload()->get('item_number')), array($payment));

            });

            return;

        }

        $registration = $registrationOptional->get();

        $command               = new PayRegistrationCommand();

            Option::fromValue($this->logger)->map(function (LoggerInterface $logger) use ($payment) {

                $logger->info(sprintf('Payment "%s" is verified.', $payment->getId()), array($payment));

            });

        } else {

            Option::fromValue($this->logger)->map(function (LoggerInterface $logger) use ($payment) {

                $logger->alert(sprintf('Payment "%s" could not be verified.', $payment->getId()), array($payment));

            });

        }

        $this->commandBus->handle($updateCommand);

    }