How many push notification subscriptions can be created for one application user?

The maximum number of subscriptions for one user is 10 and when a user exceeds this limit, it is not possible to create more subscriptions. 

If you exceed the limit your application will receive the error 422 "Unable to create a subscription because of exceeded maximum subscriptions."

You can find more information how to create push notification subscriptions for each SDK here:

iOS SDK - Push Notifications | iOS SDK | QuickBlox

Android SDK - Push Notifications | Android SDK | QuickBlox

JavaScript SDK - Push Notifications | JavaScript SDK | QuickBlox

React Native SDK - Push Notifications (quickblox.com)

Flutter SDK - Push Notifications | Flutter SDK | QuickBlox

Feel free to check our official documentation for more information that will help you to integrate QuickBlox services into your applications / projects or contact our Support team by submitting a ticket if you have any other questions.