I\'d like to be notified when someone makes an In-App Purchase in my App rather than wait until the next day to check iTunes Connect to see wether or not I had any sales.
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Fabric (formerly Crashlytics), in addition to being a fantastic (and free) crash logging system, also includes a component called Answers, which tracks usage stats in real time:
Recently, they added the ability to add custom event tracking, so it's a simple matter to add a "Product Purchased" event to you app. Adding Crashlytics to your app takes seconds (and they walk you through the process), and adding a custom event like that takes a single line of code. From then on, you'll be able to track all sorts of info about purchases made, number of users, and any other metadata you want to record, all with a delay of about 3 seconds.
I've been using Crashlytics for years (actually based on a StackOverflow question of my own), and I CANNOT recommend it highly enough. It's free, easy, and incredibly effective.