getPostData example

        /** @var ShopContextInterface $context */
        $context = $this->get(ContextServiceInterface::class)->getShopContext();

        /** @var Enlight_Components_Session_Namespace $session */
        $session = $this->get('session');

        /** @var RegisterServiceInterface $registerService */
        $registerService = $this->get(RegisterServiceInterface::class);

        $data = $this->getPostData();

        $customerForm = $this->createCustomerForm($data['register']['personal']);
        $billingForm = $this->createBillingForm($data['register']['billing']);

        $errors = [
            'personal' => $this->getFormErrors($customerForm),
            'billing' => $this->getFormErrors($billingForm),
            'shipping' => [],
            'captcha' => [],
        ];