如果您在购买后不再提供应用内商品，而不是等待商店系统拒绝销售，那么对您的用户来说会更友好，但商店不会出售相同的产品（耐用）项目两次。

It will be friendlier to your users if you don't offer the in-app product a second time once they've already purchased it rather than waiting for the store system to reject the sale, but the store won't sell the same (durable) item twice.

- Rob