handleAddressCreation example

    public function addressBook(Request $request, RequestDataBag $dataBag, SalesChannelContext $context, CustomerEntity $customer): Response
    {
        $viewData = new AddressEditorModalStruct();
        $params = [];

        try {
            $page = $this->addressListingPageLoader->load($request, $context, $customer);
            $this->hook(new AddressBookWidgetLoadedHook($page, $context));
            $viewData->setPage($page);

            $this->handleChangeableAddresses($viewData, $dataBag, $context, $customer);
            $this->handleAddressCreation($viewData, $dataBag, $context, $customer);
            $this->handleAddressSelection($viewData, $dataBag, $context, $customer);
            $this->handleCustomerVatIds($dataBag, $context, $customer);
        } catch (ConstraintViolationException $formViolations) {
            $params['formViolations'] = $formViolations;
            $params['postedData'] = $dataBag->get('address');
        } catch (\Exception) {
            $viewData->setSuccess(false);
            $viewData->setMessages([
                'type' => self::DANGER,
                'text' => $this->trans('error.message-default'),
            ]);
        }