Besides, the solution i mentioned in my previous comment above is only applicable for iOS 13.3+. How about older ios? Any workaround to be applied for the same result ?

Thanks Gualtier Malde! Regarding to your answer, I'm trying to add a notification service extension to my app. Hooking to didReceiveNotificationRequest event, then check for a pre-defined title/body string to surpress/cancel user notification to be presented using com.apple.developer.usernotifications.filtering entitlement as stated in below thread https://developer.apple.com/forums/thread/661320 May that posible @Malde ?

Yup I know, but i'm still looking for a workaround, is there a way to implement a background service that never dies in iOS ?