public function rules(): array 	{ 		return [ 			'delivery_country' => ['bail', 'required', 'string', 'uppercase', 'size:2'],  			'products' => ['required', 'array'], 			'products.*.product_id' => ['required', 'uuid', 'distinct', new ProductIsAvailableForOrder], 			'products.*.quantity' => ['required', 'integer', 'min:1'], 		]; 	}