Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/kotlin/properties/Delegates.java

@@ -0,0 +1,43 @@
+package kotlin.properties;
+
+import com.google.android.gms.measurement.api.AppMeasurementSdk;
+import kotlin.Metadata;
+import kotlin.Unit;
+import kotlin.jvm.functions.Function3;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.reflect.KProperty;
+
+@Metadata(d1 = {"\u00002\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0004\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\b\u0004\n\u0002\u0010\u0002\n\u0002\b\u0002\n\u0002\u0010\u000b\n\u0000\bÆ\u0002\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002J\u001e\u0010\u0003\u001a\u0010\u0012\u0006\u0012\u0004\u0018\u00010\u0001\u0012\u0004\u0012\u0002H\u00050\u0004\"\b\b\u0000\u0010\u0005*\u00020\u0001J\u0080\u0001\u0010\u0006\u001a\u0010\u0012\u0006\u0012\u0004\u0018\u00010\u0001\u0012\u0004\u0012\u0002H\u00050\u0004\"\u0004\b\u0000\u0010\u00052\u0006\u0010\u0007\u001a\u0002H\u00052Q\b\u0004\u0010\b\u001aK\u0012\u0017\u0012\u0015\u0012\u0002\b\u00030\n¢\u0006\f\b\u000b\u0012\b\b\f\u0012\u0004\b\b(\r\u0012\u0013\u0012\u0011H\u0005¢\u0006\f\b\u000b\u0012\b\b\f\u0012\u0004\b\b(\u000e\u0012\u0013\u0012\u0011H\u0005¢\u0006\f\b\u000b\u0012\b\b\f\u0012\u0004\b\b(\u000f\u0012\u0004\u0012\u00020\u00100\tH\u0086\bø\u0001\u0000¢\u0006\u0002\u0010\u0011J\u0080\u0001\u0010\u0012\u001a\u0010\u0012\u0006\u0012\u0004\u0018\u00010\u0001\u0012\u0004\u0012\u0002H\u00050\u0004\"\u0004\b\u0000\u0010\u00052\u0006\u0010\u0007\u001a\u0002H\u00052Q\b\u0004\u0010\b\u001aK\u0012\u0017\u0012\u0015\u0012\u0002\b\u00030\n¢\u0006\f\b\u000b\u0012\b\b\f\u0012\u0004\b\b(\r\u0012\u0013\u0012\u0011H\u0005¢\u0006\f\b\u000b\u0012\b\b\f\u0012\u0004\b\b(\u000e\u0012\u0013\u0012\u0011H\u0005¢\u0006\f\b\u000b\u0012\b\b\f\u0012\u0004\b\b(\u000f\u0012\u0004\u0012\u00020\u00130\tH\u0086\bø\u0001\u0000¢\u0006\u0002\u0010\u0011\u0082\u0002\u0007\n\u0005\b\u009920\u0001¨\u0006\u0014"}, d2 = {"Lkotlin/properties/Delegates;", "", "()V", "notNull", "Lkotlin/properties/ReadWriteProperty;", "T", "observable", "initialValue", "onChange", "Lkotlin/Function3;", "Lkotlin/reflect/KProperty;", "Lkotlin/ParameterName;", AppMeasurementSdk.ConditionalUserProperty.NAME, "property", "oldValue", "newValue", "", "(Ljava/lang/Object;Lkotlin/jvm/functions/Function3;)Lkotlin/properties/ReadWriteProperty;", "vetoable", "", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public final class Delegates {
+    public static final Delegates INSTANCE = new Delegates();
+
+    private Delegates() {
+    }
+
+    public final <T> ReadWriteProperty<Object, T> notNull() {
+        return new NotNullVar();
+    }
+
+    public final <T> ReadWriteProperty<Object, T> observable(final T initialValue, final Function3<? super KProperty<?>, ? super T, ? super T, Unit> onChange) {
+        Intrinsics.checkNotNullParameter(onChange, "onChange");
+        return new ObservableProperty<T>(initialValue) { // from class: kotlin.properties.Delegates$observable$1
+            @Override // kotlin.properties.ObservableProperty
+            public void afterChange(KProperty<?> property, T oldValue, T newValue) {
+                Intrinsics.checkNotNullParameter(property, "property");
+                onChange.invoke(property, oldValue, newValue);
+            }
+        };
+    }
+
+    public final <T> ReadWriteProperty<Object, T> vetoable(final T initialValue, final Function3<? super KProperty<?>, ? super T, ? super T, Boolean> onChange) {
+        Intrinsics.checkNotNullParameter(onChange, "onChange");
+        return new ObservableProperty<T>(initialValue) { // from class: kotlin.properties.Delegates$vetoable$1
+            @Override // kotlin.properties.ObservableProperty
+            public boolean beforeChange(KProperty<?> property, T oldValue, T newValue) {
+                Intrinsics.checkNotNullParameter(property, "property");
+                return onChange.invoke(property, oldValue, newValue).booleanValue();
+            }
+        };
+    }
+}