关于通过Advanced commerce API 创建SKU，有几个问题：
1、通过Advanced commerce API创建的自动续费订阅的SKU是否支持推介优惠、促销优惠？如果可以，是在苹果connect设置吗？
2、已订阅通过connect创建的SKU的用户，是否可以重复订阅通过Advanced commerce API创建的SKU？还是要通过Advanced commerce API变更订阅？
3、Advanced commerce API创建的SKU ,用户订阅成功后，续费的扣款是否仍由苹果发起？还是由开发者自行发起？
感谢给我们提出问题。以下是针对你的问题的解答：
1.You need to provide offer / promotion at the time of purchase using https://developer.apple.com/documentation/advancedcommerceapi/offer
2.A customer can subscribe to different SKUs via Advanced commerce API, and different subscription groups via regular IAP which created by App Store Connect. You may migrate a subscription that a customer purchased through In-App Purchase to a subscription you manage using the Advanced Commerce API, but it not mandatory.
The product identifier you create in app store connect is generic product identifier. Generic product Identifiers only contain placeholder information for prices, localizations, and subscription periods and is overridden at the time of purchase. It is suggest to provide a different SKU identifier at runtime. Note: You assign a SKU to each product, along with other information such as the display name, description, and price.
https://developer.apple.com/documentation/advancedcommerceapi/sku
3.Renewals are processed through App Store for Auto-Renewable subscription.
