-keep class com.my.tracker.** { *; }
-dontwarn com.my.tracker.**
-keep class com.google.android.gms.ads.identifier.** { *; }
-keep class com.android.installreferrer.** { *; }
-keep class com.android.vending.billing.** { *; }
-keep class com.android.billingclient.api.** { *; }