public function rules(): array 	{ 		return [ 			'name' => ['required', 'string', 'max:50'], 			'email' => ['required', 'email', 'max:50'], 			'phone' => ['required', 'string', 'max:20'], 			'company_name' => ['nullable', 'required_with:vat', 'string', 'max:50'], 			'vat' => ['nullable', 'required_with:company_name', 'string', 'max:20'],  			'delivery_address' => ['required', 'string', 'max:50'], 			'delivery_city' => ['required', 'string', 'max:50'], 			'delivery_zip_code' => ['required', 'string', 'max:20'], 			'delivery_country' => ['required', 'string', 'uppercase', 'size:2'],  			'billing_address' => ['required', 'string', 'max:50'], 			'billing_city' => ['required', 'string', 'max:50'], 			'billing_zip_code' => ['required', 'string', 'max:20'], 			'billing_country' => ['required', 'string', 'uppercase', 'size:2'], 			'tracking_number' => ['nullable', 'string', 'max:50'], 		]; 	}