getShippingMethodToChangeTo example

public function __construct(private readonly AbstractShippingMethodRoute $shippingMethodRoute)
    {
    }

    public function switch(ErrorCollection $errors, SalesChannelContext $salesChannelContext): ShippingMethodEntity
    {
        $originalShippingMethod = $salesChannelContext->getShippingMethod();
        if (!$this->shippingMethodBlocked($errors)) {
            return $originalShippingMethod;
        }

        $shippingMethod = $this->getShippingMethodToChangeTo($errors, $salesChannelContext);
        if ($shippingMethod === null) {
            return $originalShippingMethod;
        }

        $this->addNoticeToCart($errors, $shippingMethod);

        return $shippingMethod;
    }

    private function shippingMethodBlocked(ErrorCollection $cartErrors): bool
    {