问题
As Apple doc said in this doc: https://developer.apple.com/documentation/appstoreservernotifications/notification_type?changes=_2
Subscription event | Notification types triggered
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Auto-renewal disabled (canceled) from
the App Store account's Subscriptions settings | DID_CHANGE_RENEWAL_STATUS
AppleCare refund | CANCEL, DID_CHANGE_RENEWAL_STATUS
When AppleCare refund happend, there are two notification types triggered, one of them is DID_CHANGE_RENEWAL_STATUS. And when cancel subscription happened, its notification type is DID_CHANGE_RENEWAL_STATUS too. So, when i got a notification with notification_type DID_CHANGE_RENEWAL_STATUS, how could i know whether the user has refunded or canceled?
回答1:
I don't know why Apple triggers CANCEL as well as DID_CHANGE_RENEWAL_STATUS, but technical it is correct. The user cancels his subscription (you get the CANCEL notification) and this also changes the renewal status (you get the DID_CHANGE_RENEWAL_STATUS notification—obviously the subscription won't renew in the future).
To your question: you know a refund happend when you receive the CANCEL notification and when the server response body with the DID_CHANGE_RENEWAL_STATUS notification contains the cancellation_date_ms in Latest_receipt_info.
cancellation_date_ms
The time and date that Apple customer support canceled a transaction or the time and date the user upgraded an auto-renewable subscription.
see here for more details.
Don't worry in the case that a user upgrades his subscription, your server will receive additionally to CANCEL and DID_CHANGE_RENEWAL_STATUS the INTERACTIVE_RENEWAL notification.
In the case the user canceled (deactivated auto-renew) the field auto_renew_status (documentation) in the response body is set to 0.
来源：https://stackoverflow.com/questions/60378058/question-about-server-to-server-notification