public function processPayment()
    {
        $redsysMethod = $this
            ->redsysMethodFactory
            ->create();

        /**
         * At this point, order must be created given a cart, and placed in PaymentBridge.
         *
         * So, $this->paymentBridge->getOrder() must return an object
         */
        $this
            ->paymentEventDispatcher
            ->notifyPaymentOrderLoad(
                $this->paymentBridge,
                $redsysMethod
            );

        /**
         * Order Not found Exception must be thrown just here.
         */
        if (!$this->paymentBridge->getOrder()) {
            throw new PaymentOrderNotFoundException();
        }

        /**
         * Order exists right here.
         */
        $this
            ->paymentEventDispatcher
            ->notifyPaymentOrderCreated(
                $this->paymentBridge,
                $redsysMethod
            );

        return $this
            ->redsysFormTypeBuilder
            ->buildForm();
    }