When you integrate a Singular SDK or S2S into your app, Singular tracks several types of in-app events automatically, without you having to add code to send them to Singular when they happen.

These built-in events may appear in:

User-level attribution logs (see Export Logs and User-Level Data FAQ)
Partner postbacks (if the partner is receiving the auto-generated event name)
Internal BI postbacks

To learn more about events, see the Events FAQ and How to Track In-App Events.

Supported Built-In Events

Event Name	Description	When It Is Tracked
__START__	Install	Automatically tracked when the first session is sent through an SDK/S2S integration.
__SESSION__	Session	Automatically tracked when sessions are sent through an SDK/S2S integration.
__iap__	SDK Revenue	Tracked if an SDK/S2S integration is reporting a revenue event through the revenue method.
__REVENUE__	Any Revenue	Tracked if any revenue is reported, for example: If an __iap__ event is triggered If the SDK reports an ad revenue event If you are reporting revenue via S2S with an event name like "purchase". If you are reporting other revenue events such as "refund" or "offline purchase" Note: We do not recommend sending postbacks for this event if you are already sending postbacks for __iap__ or other revenue events, as you may end up reporting duplicate revenue.
__UNINSTALL__	Uninstall	Automatically tracked if uninstall is enabled for your iOS or Android app, and at least one uninstall has been tracked. If an uninstall is detected for a device, it is triggered once a day.
__REINSTALL__	Reinstall	Automatically tracked if uninstall is enabled via the SDK/S2S. If an __UNINSTALL__ for a device is tracked, and then a subsequent __SESSION__ is triggered, the __REINSTALL__ event is also triggered