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Unfortunately, the logo can not be updated after the user has already subscribed. Existing subscribers would need to fully clear their browser stored content including existing push subscriptions, and then opt-in to notifications again.

Hi. I help work on OneSignal and I happened to see this message here. Technically you can use OneSignal for this. OneSignal supports importing tokens via API, and then delivering notifications to them through OneSignal's API or dashboard. You will first have to make sure you can export your existing push tokens from Firebase. Note that many OneSignal features (such as tracking your notification click rate) won't work until you add the OneSignal library to your app and users update to the new version, but at least you can send them notifications. You can contact OneSignal support and reference this message for assistance if you're not sure where to start. You can also use the APNS APIs directly for this, but it might be a little more complex. Apple's APNS APIs are documented here https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/APNSOverview.html#//apple_ref/doc/uid/TP40008194-CH8-SW1

I believe the HTTP2 API provides the same capability, but asynchronously in response to each request instead of having to use the feedback service. So no capabilities are lost in the switch from the binary API to the HTTP2 API, but the implementation is different. However we have a similar need as the original author here. We would like to know when notifications may be leading users to uninstall an application. For example, we may want to test the delivery of a promotion via a push notification to a small group of people, and then make sure that it doesn't lead to a high uninstall rate before delivering it to a larger group of people. Or another use-case of detecting uninstalled applications would be to support failover to another messaging channel such as email or SMS.

This is a really serious change that will break a lot of apps. The "description" method has been the documented way to get the push token in dozens of books, hundreds of online tutorials, SDKs, etc.For example, this StackOverflow answer guides readers towards this implementation and has over 160,000 views: https://stackoverflow.com/questions/8798725/get-device-token-for-push-notification/8798981#8798981This problem was introduced in iOS 13 Beta 2 and doesn't appear to have affected Beta 1. So even though we tested the beta, we didn't notice until just now.