Hi,
Is it possible for server-to-server notifications to be sent out of order? Or, is it safe to assume that Apple will guarantee the order (i.e. preserve the order as determined by the user) they are sent to our servers?
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Brennan
Subscription Notification Order
Apple doesn't guarantee that you will get the notifications. I think that trumps whether or not they are out of order.
Where does Apple state this? Can you please provide a link to this? Thanks.
Since Apple can't guarantee the connection, Apple can't guarantee a notification will be sent. Not sent = not get.
Quoting from:
"Security Requirements
Before sending a notification, the App Store tries to establish a secure network connection with your server by using App Transport Security (ATS) protocols. To learn more about ATS requirements, see “Requirements for Connecting Using ATS”. If a secure connection cannot be established, notifications will not be sent to your server. For more about security, see https://developer.apple.com/security/."
https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/StoreKitGuide/Chapters/Subscriptions.html There are a few situations listed where a notification will not be delivered. Use this system as a front end but back it up with receipt refresh and verification