SetPaymentOrderRouteResponse example

$order,
            $context->getContext(),
            [SalesChannelContextService::PAYMENT_METHOD_ID => $paymentMethodId]
        );

        $this->validateRequest($context, $paymentMethodId);

        $this->validatePaymentState($order);

        $this->setPaymentMethod($paymentMethodId, $order, $context);

        return new SetPaymentOrderRouteResponse();
    }

    private function setPaymentMethod(string $paymentMethodId, OrderEntity $order, SalesChannelContext $salesChannelContext): void
    {
        $context = $salesChannelContext->getContext();

        if ($this->tryTransition($order, $paymentMethodId, $context)) {
            return;
        }

        $initialState = $this->initialStateIdLoader->get(OrderTransactionStates::STATE_MACHINE);