We are currently using GA for logging events, Urban airship for InApp notifications/re-engagement, Apsalar for attribution.
Using notification driven re-engagement has improved our metrics and revenue so we are exploring more comprehensive re-engagement (Email, SMS).
There are some tools in the market (Clevertap, Netcore) which offer the bouquet of notification, email and sms but to achieve that we have to share a lot of data and user's email and mobile with them.
Ideally we would like a service which can send a postback to our server with event name and parameters so we can take necessary action. This helps us have a better privacy policy, cheaper email and sms delivery.
Apsalar does offer postback but only for install event.
Is there any solution which we can integrate to achieve this. Better if it works across platforms (iOS, Android and Web)