public function rules(): array 	{ 		return [ 			...parent::rules(), 			'lastname' => ['nullable', 'string', 'max:50'], 			'address' => ['nullable', 'string', 'max:100'], 			'zip_code' => ['nullable', 'string', 'max:20'], 			'city' => ['nullable', 'string', 'max:50'], 			'country_code' => ['nullable', 'string', 'size:2', 'exists:' . DeliveryPrice::class . ',country_code'], 			'phone_number' => ['nullable', 'string', 'max:20'], 			'corporation_name' => ['nullable', 'string', 'max:100'], 			'corporation_vat_number' => ['nullable', 'string', 'max:30'], 			'corporation_base_address' => ['nullable', 'string', 'max:100'], 			'corporation_country_code' => ['nullable', 'string', 'size:2', 'exists:' . DeliveryPrice::class . ',country_code'], 			'newsletter_subscription' => ['boolean'], 		]; 	}