- appPurchaseDate
- The purchase date when the user actually made the purchase. This parameter can be null.
- iAdImpressionDate
- The date when the user saw and interacted with the ad, before purchasing the app. This parameter can be null.
If both dates are present this means that the installation of your application is the result of the user seeing the iAd and installing the application as a result of watching the iAd.
The values could be null either because the user has a “Limit Ad Tracking” enabled, or if the user did not install your application due to watching an iAd.