Non-Renewing Subscription
Non-renewing subscriptions allow the sale of items with a limited duration. They are used for products that offer time-based access to static content.
If you use non-renewing subscriptions, your app is responsible for delivering the subscription to all devices associated with the user’s Apple ID.
Because a non-renewing subscription requires a user to renew each time the subscription ends, your app must contain code that recognizes when the subscription is due to expire and prompt the user to purchase a new subscription.
这个意味着你需要有一套用户系统，记录用户的购买时间和过期时间。
苹果服务器不会记录你的 Non-Renewing Subscription 的信息。
且购买的行为事件只发送过一次。
