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/firebase/messaging/FirebaseMessagingRegistrar.java

@@ -0,0 +1,34 @@
+package com.google.firebase.messaging;
+
+import androidx.annotation.Keep;
+import com.google.android.gms.common.annotation.KeepForSdk;
+import com.google.firebase.FirebaseApp;
+import com.google.firebase.components.Component;
+import com.google.firebase.components.ComponentContainer;
+import com.google.firebase.components.ComponentRegistrar;
+import com.google.firebase.components.Dependency;
+import com.google.firebase.events.Subscriber;
+import com.google.firebase.heartbeatinfo.HeartBeatInfo;
+import com.google.firebase.iid.internal.FirebaseInstanceIdInternal;
+import com.google.firebase.installations.FirebaseInstallationsApi;
+import com.google.firebase.platforminfo.LibraryVersionComponent;
+import com.google.firebase.platforminfo.UserAgentPublisher;
+import java.util.Arrays;
+import java.util.List;
+
+@Keep
+@KeepForSdk
+/* loaded from: classes3.dex */
+public class FirebaseMessagingRegistrar implements ComponentRegistrar {
+    private static final String LIBRARY_NAME = "fire-fcm";
+
+    public static /* synthetic */ FirebaseMessaging lambda$getComponents$0(ComponentContainer componentContainer) {
+        return new FirebaseMessaging((FirebaseApp) componentContainer.get(FirebaseApp.class), (FirebaseInstanceIdInternal) componentContainer.get(FirebaseInstanceIdInternal.class), componentContainer.getProvider(UserAgentPublisher.class), componentContainer.getProvider(HeartBeatInfo.class), (FirebaseInstallationsApi) componentContainer.get(FirebaseInstallationsApi.class), (T1.g) componentContainer.get(T1.g.class), (Subscriber) componentContainer.get(Subscriber.class));
+    }
+
+    @Override // com.google.firebase.components.ComponentRegistrar
+    @Keep
+    public List<Component<?>> getComponents() {
+        return Arrays.asList(Component.builder(FirebaseMessaging.class).name(LIBRARY_NAME).add(Dependency.required((Class<?>) FirebaseApp.class)).add(Dependency.optional(FirebaseInstanceIdInternal.class)).add(Dependency.optionalProvider((Class<?>) UserAgentPublisher.class)).add(Dependency.optionalProvider((Class<?>) HeartBeatInfo.class)).add(Dependency.optional(T1.g.class)).add(Dependency.required((Class<?>) FirebaseInstallationsApi.class)).add(Dependency.required((Class<?>) Subscriber.class)).factory(new M2.a(8)).alwaysEager().build(), LibraryVersionComponent.create(LIBRARY_NAME, BuildConfig.VERSION_NAME));
+    }
+}