Called when application is uninstalled.
|CLEAN=1/0||The value of the option data" delete application data" selected by a user when uninstalling the application.|
|application_token||Secret identifier (see Safety Check in Events).|
Attention: when an application is being uninstalled, the application access permission for REST API are removed as well. Therefore the OnAppUninstall handler cannot call the API's on behalf of the application even though authentication data is passed to it.