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/com/google/android/gms/location/ActivityTransitionRequest.java

@@ -0,0 +1,111 @@
+package com.google.android.gms.location;
+
+import android.content.Intent;
+import android.os.Parcel;
+import android.os.Parcelable;
+import com.google.android.gms.common.internal.Objects;
+import com.google.android.gms.common.internal.Preconditions;
+import com.google.android.gms.common.internal.safeparcel.AbstractSafeParcelable;
+import com.google.android.gms.common.internal.safeparcel.SafeParcelWriter;
+import com.google.android.gms.common.internal.safeparcel.SafeParcelable;
+import com.google.android.gms.common.internal.safeparcel.SafeParcelableSerializer;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.List;
+import java.util.TreeSet;
+
+@SafeParcelable.Class(creator = "ActivityTransitionRequestCreator")
+@SafeParcelable.Reserved({1000})
+/* loaded from: classes3.dex */
+public class ActivityTransitionRequest extends AbstractSafeParcelable {
+    public static final Parcelable.Creator<ActivityTransitionRequest> CREATOR = new zzh();
+    public static final Comparator<ActivityTransition> IS_SAME_TRANSITION = new zzg();
+
+    @SafeParcelable.Field(getter = "getActivityTransitions", id = 1)
+    private final List zza;
+
+    @SafeParcelable.Field(getter = "getTag", id = 2)
+    private final String zzb;
+
+    @SafeParcelable.Field(getter = "getClients", id = 3)
+    private final List zzc;
+
+    @SafeParcelable.Field(defaultValueUnchecked = "null", getter = "getContextAttributionTag", id = 4)
+    private String zzd;
+
+    public ActivityTransitionRequest(List<ActivityTransition> list) {
+        this(list, null, null, null);
+    }
+
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj != null && getClass() == obj.getClass()) {
+            ActivityTransitionRequest activityTransitionRequest = (ActivityTransitionRequest) obj;
+            if (Objects.equal(this.zza, activityTransitionRequest.zza) && Objects.equal(this.zzb, activityTransitionRequest.zzb) && Objects.equal(this.zzd, activityTransitionRequest.zzd) && Objects.equal(this.zzc, activityTransitionRequest.zzc)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public int hashCode() {
+        int hashCode = this.zza.hashCode() * 31;
+        String str = this.zzb;
+        int hashCode2 = (hashCode + (str != null ? str.hashCode() : 0)) * 31;
+        List list = this.zzc;
+        int hashCode3 = (hashCode2 + (list != null ? list.hashCode() : 0)) * 31;
+        String str2 = this.zzd;
+        return hashCode3 + (str2 != null ? str2.hashCode() : 0);
+    }
+
+    public void serializeToIntentExtra(Intent intent) {
+        Preconditions.checkNotNull(intent);
+        SafeParcelableSerializer.serializeToIntentExtra(this, intent, "com.google.android.location.internal.EXTRA_ACTIVITY_TRANSITION_REQUEST");
+    }
+
+    public String toString() {
+        return "ActivityTransitionRequest [mTransitions=" + String.valueOf(this.zza) + ", mTag='" + this.zzb + "', mClients=" + String.valueOf(this.zzc) + ", mAttributionTag=" + this.zzd + "]";
+    }
+
+    @Override // android.os.Parcelable
+    public void writeToParcel(Parcel parcel, int i) {
+        Preconditions.checkNotNull(parcel);
+        int beginObjectHeader = SafeParcelWriter.beginObjectHeader(parcel);
+        SafeParcelWriter.writeTypedList(parcel, 1, this.zza, false);
+        SafeParcelWriter.writeString(parcel, 2, this.zzb, false);
+        SafeParcelWriter.writeTypedList(parcel, 3, this.zzc, false);
+        SafeParcelWriter.writeString(parcel, 4, this.zzd, false);
+        SafeParcelWriter.finishObjectHeader(parcel, beginObjectHeader);
+    }
+
+    public final ActivityTransitionRequest zza(String str) {
+        this.zzd = str;
+        return this;
+    }
+
+    @SafeParcelable.Constructor
+    public ActivityTransitionRequest(@SafeParcelable.Param(id = 1) List list, @SafeParcelable.Param(id = 2) String str, @SafeParcelable.Param(id = 3) List list2, @SafeParcelable.Param(id = 4) String str2) {
+        List unmodifiableList;
+        Preconditions.checkNotNull(list, "transitions can't be null");
+        Preconditions.checkArgument(list.size() > 0, "transitions can't be empty.");
+        Preconditions.checkNotNull(list);
+        TreeSet treeSet = new TreeSet(IS_SAME_TRANSITION);
+        Iterator it = list.iterator();
+        while (it.hasNext()) {
+            ActivityTransition activityTransition = (ActivityTransition) it.next();
+            Preconditions.checkArgument(treeSet.add(activityTransition), String.format("Found duplicated transition: %s.", activityTransition));
+        }
+        this.zza = Collections.unmodifiableList(list);
+        this.zzb = str;
+        if (list2 == null) {
+            unmodifiableList = Collections.EMPTY_LIST;
+        } else {
+            unmodifiableList = Collections.unmodifiableList(list2);
+        }
+        this.zzc = unmodifiableList;
+        this.zzd = str2;
+    }
+}