isValidShippingAddress example

if ($form->isSubmitted() && $form->isValid()) {
            $userId = $this->get('session')->get('sUserId');
            $customer = $this->get(ModelManager::class)->find(Customer::class, $userId);

            $this->addressService->create($address, $customer);

            if (!empty($address->getAdditional()['setDefaultBillingAddress'])) {
                $this->addressService->setDefaultBillingAddress($address);
            }

            if ($this->isValidShippingAddress($address) && !empty($address->getAdditional()['setDefaultShippingAddress'])) {
                $this->addressService->setDefaultShippingAddress($address);
            }

            if ($this->Request()->getParam('sTarget')) {
                $action = $this->Request()->getParam('sTargetAction', 'index') ?: 'index';
                $this->redirect([
                    'controller' => $this->Request()->getParam('sTarget'),
                    'action' => $action,
                    'success' => 'address',
                ]);