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/kotlinx/coroutines/InvokeOnCancelling.java

@@ -0,0 +1,43 @@
+package kotlinx.coroutines;
+
+import com.google.android.gms.measurement.api.AppMeasurementSdk;
+import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
+import kotlin.Metadata;
+import kotlin.Unit;
+import kotlin.jvm.functions.Function1;
+
+/* JADX INFO: Access modifiers changed from: package-private */
+@Metadata(d1 = {"\u0000.\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0002\u0010\u0003\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\b\u0002\u0018\u00002\u00020\u0001B.\u0012'\u0010\u0002\u001a#\u0012\u0015\u0012\u0013\u0018\u00010\u0004¢\u0006\f\b\u0005\u0012\b\b\u0006\u0012\u0004\b\b(\u0007\u0012\u0004\u0012\u00020\b0\u0003j\u0002`\t¢\u0006\u0002\u0010\nJ\u0013\u0010\r\u001a\u00020\b2\b\u0010\u0007\u001a\u0004\u0018\u00010\u0004H\u0096\u0002R\t\u0010\u000b\u001a\u00020\fX\u0082\u0004R/\u0010\u0002\u001a#\u0012\u0015\u0012\u0013\u0018\u00010\u0004¢\u0006\f\b\u0005\u0012\b\b\u0006\u0012\u0004\b\b(\u0007\u0012\u0004\u0012\u00020\b0\u0003j\u0002`\tX\u0082\u0004¢\u0006\u0002\n\u0000¨\u0006\u000e"}, d2 = {"Lkotlinx/coroutines/InvokeOnCancelling;", "Lkotlinx/coroutines/JobCancellingNode;", "handler", "Lkotlin/Function1;", "", "Lkotlin/ParameterName;", AppMeasurementSdk.ConditionalUserProperty.NAME, "cause", "", "Lkotlinx/coroutines/CompletionHandler;", "(Lkotlin/jvm/functions/Function1;)V", "_invoked", "Lkotlinx/atomicfu/AtomicInt;", "invoke", "kotlinx-coroutines-core"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public final class InvokeOnCancelling extends JobCancellingNode {
+    private static final /* synthetic */ AtomicIntegerFieldUpdater _invoked$volatile$FU = AtomicIntegerFieldUpdater.newUpdater(InvokeOnCancelling.class, "_invoked$volatile");
+    private volatile /* synthetic */ int _invoked$volatile;
+    private final Function1<Throwable, Unit> handler;
+
+    /* JADX WARN: Multi-variable type inference failed */
+    public InvokeOnCancelling(Function1<? super Throwable, Unit> function1) {
+        this.handler = function1;
+    }
+
+    private final /* synthetic */ int get_invoked$volatile() {
+        return this._invoked$volatile;
+    }
+
+    private final /* synthetic */ void set_invoked$volatile(int i) {
+        this._invoked$volatile = i;
+    }
+
+    @Override // kotlin.jvm.functions.Function1
+    public /* bridge */ /* synthetic */ Unit invoke(Throwable th) {
+        invoke2(th);
+        return Unit.INSTANCE;
+    }
+
+    @Override // kotlinx.coroutines.CompletionHandlerBase
+    /* renamed from: invoke, reason: avoid collision after fix types in other method */
+    public void invoke2(Throwable cause) {
+        if (_invoked$volatile$FU.compareAndSet(this, 0, 1)) {
+            this.handler.invoke(cause);
+        }
+    }
+}