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/common/wrappers/InstantApps.java

@@ -0,0 +1,37 @@
+package com.google.android.gms.common.wrappers;
+
+import android.content.Context;
+import com.google.android.gms.common.annotation.KeepForSdk;
+import com.google.android.gms.common.util.PlatformVersion;
+
+@KeepForSdk
+/* loaded from: classes3.dex */
+public class InstantApps {
+    private static Context zza;
+    private static Boolean zzb;
+
+    @KeepForSdk
+    public static synchronized boolean isInstantApp(Context context) {
+        Boolean bool;
+        synchronized (InstantApps.class) {
+            Context applicationContext = context.getApplicationContext();
+            Context context2 = zza;
+            if (context2 != null && (bool = zzb) != null && context2 == applicationContext) {
+                return bool.booleanValue();
+            }
+            zzb = null;
+            if (PlatformVersion.isAtLeastO()) {
+                zzb = Boolean.valueOf(applicationContext.getPackageManager().isInstantApp());
+            } else {
+                try {
+                    context.getClassLoader().loadClass("com.google.android.instantapps.supervisor.InstantAppsRuntime");
+                    zzb = Boolean.TRUE;
+                } catch (ClassNotFoundException unused) {
+                    zzb = Boolean.FALSE;
+                }
+            }
+            zza = applicationContext;
+            return zzb.booleanValue();
+        }
+    }
+}

apk_decompiled/sources/com/google/android/gms/common/wrappers/PackageManagerWrapper.java

@@ -0,0 +1,91 @@
+package com.google.android.gms.common.wrappers;
+
+import N.b;
+import android.annotation.TargetApi;
+import android.app.AppOpsManager;
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.os.Binder;
+import android.os.Process;
+import com.google.android.gms.common.annotation.KeepForSdk;
+import com.google.android.gms.common.util.PlatformVersion;
+
+@KeepForSdk
+/* loaded from: classes3.dex */
+public class PackageManagerWrapper {
+    protected final Context zza;
+
+    public PackageManagerWrapper(Context context) {
+        this.zza = context;
+    }
+
+    @KeepForSdk
+    public int checkCallingOrSelfPermission(String str) {
+        return this.zza.checkCallingOrSelfPermission(str);
+    }
+
+    @KeepForSdk
+    public int checkPermission(String str, String str2) {
+        return this.zza.getPackageManager().checkPermission(str, str2);
+    }
+
+    @KeepForSdk
+    public ApplicationInfo getApplicationInfo(String str, int i) throws PackageManager.NameNotFoundException {
+        return this.zza.getPackageManager().getApplicationInfo(str, i);
+    }
+
+    @KeepForSdk
+    public CharSequence getApplicationLabel(String str) throws PackageManager.NameNotFoundException {
+        return this.zza.getPackageManager().getApplicationLabel(this.zza.getPackageManager().getApplicationInfo(str, 0));
+    }
+
+    @KeepForSdk
+    public b getApplicationLabelAndIcon(String str) throws PackageManager.NameNotFoundException {
+        ApplicationInfo applicationInfo = this.zza.getPackageManager().getApplicationInfo(str, 0);
+        return new b(this.zza.getPackageManager().getApplicationLabel(applicationInfo), this.zza.getPackageManager().getApplicationIcon(applicationInfo));
+    }
+
+    @KeepForSdk
+    public PackageInfo getPackageInfo(String str, int i) throws PackageManager.NameNotFoundException {
+        return this.zza.getPackageManager().getPackageInfo(str, i);
+    }
+
+    @KeepForSdk
+    public boolean isCallerInstantApp() {
+        String nameForUid;
+        if (Binder.getCallingUid() == Process.myUid()) {
+            return InstantApps.isInstantApp(this.zza);
+        }
+        if (!PlatformVersion.isAtLeastO() || (nameForUid = this.zza.getPackageManager().getNameForUid(Binder.getCallingUid())) == null) {
+            return false;
+        }
+        return this.zza.getPackageManager().isInstantApp(nameForUid);
+    }
+
+    @TargetApi(19)
+    public final boolean zza(int i, String str) {
+        if (PlatformVersion.isAtLeastKitKat()) {
+            try {
+                AppOpsManager appOpsManager = (AppOpsManager) this.zza.getSystemService("appops");
+                if (appOpsManager == null) {
+                    throw new NullPointerException("context.getSystemService(Context.APP_OPS_SERVICE) is null");
+                }
+                appOpsManager.checkPackage(i, str);
+                return true;
+            } catch (SecurityException unused) {
+                return false;
+            }
+        }
+        String[] packagesForUid = this.zza.getPackageManager().getPackagesForUid(i);
+        if (str != null && packagesForUid != null) {
+            for (String str2 : packagesForUid) {
+                if (str.equals(str2)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}

apk_decompiled/sources/com/google/android/gms/common/wrappers/Wrappers.java

@@ -0,0 +1,32 @@
+package com.google.android.gms.common.wrappers;
+
+import android.content.Context;
+import com.google.android.gms.common.annotation.KeepForSdk;
+import com.google.android.gms.common.util.VisibleForTesting;
+
+@KeepForSdk
+/* loaded from: classes3.dex */
+public class Wrappers {
+    private static Wrappers zza = new Wrappers();
+    private PackageManagerWrapper zzb = null;
+
+    @KeepForSdk
+    public static PackageManagerWrapper packageManager(Context context) {
+        return zza.zza(context);
+    }
+
+    @VisibleForTesting
+    public final synchronized PackageManagerWrapper zza(Context context) {
+        try {
+            if (this.zzb == null) {
+                if (context.getApplicationContext() != null) {
+                    context = context.getApplicationContext();
+                }
+                this.zzb = new PackageManagerWrapper(context);
+            }
+        } catch (Throwable th) {
+            throw th;
+        }
+        return this.zzb;
+    }
+}