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/sequences/SubSequence.java

@@ -0,0 +1,58 @@
+package kotlin.sequences;
+
+import C.w;
+import com.google.android.gms.measurement.internal.a;
+import java.util.Iterator;
+import kotlin.Metadata;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.jvm.internal.SourceDebugExtension;
+
+@Metadata(d1 = {"\u0000\"\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010\b\n\u0002\b\b\n\u0002\u0010(\n\u0002\b\u0002\b\u0000\u0018\u0000*\u0004\b\u0000\u0010\u00012\b\u0012\u0004\u0012\u0002H\u00010\u00022\b\u0012\u0004\u0012\u0002H\u00010\u0003B#\u0012\f\u0010\u0004\u001a\b\u0012\u0004\u0012\u00028\u00000\u0002\u0012\u0006\u0010\u0005\u001a\u00020\u0006\u0012\u0006\u0010\u0007\u001a\u00020\u0006¢\u0006\u0002\u0010\bJ\u0016\u0010\f\u001a\b\u0012\u0004\u0012\u00028\u00000\u00022\u0006\u0010\r\u001a\u00020\u0006H\u0016J\u000f\u0010\u000e\u001a\b\u0012\u0004\u0012\u00028\u00000\u000fH\u0096\u0002J\u0016\u0010\u0010\u001a\b\u0012\u0004\u0012\u00028\u00000\u00022\u0006\u0010\r\u001a\u00020\u0006H\u0016R\u0014\u0010\t\u001a\u00020\u00068BX\u0082\u0004¢\u0006\u0006\u001a\u0004\b\n\u0010\u000bR\u000e\u0010\u0007\u001a\u00020\u0006X\u0082\u0004¢\u0006\u0002\n\u0000R\u0014\u0010\u0004\u001a\b\u0012\u0004\u0012\u00028\u00000\u0002X\u0082\u0004¢\u0006\u0002\n\u0000R\u000e\u0010\u0005\u001a\u00020\u0006X\u0082\u0004¢\u0006\u0002\n\u0000¨\u0006\u0011"}, d2 = {"Lkotlin/sequences/SubSequence;", "T", "Lkotlin/sequences/Sequence;", "Lkotlin/sequences/DropTakeSequence;", "sequence", "startIndex", "", "endIndex", "(Lkotlin/sequences/Sequence;II)V", "count", "getCount", "()I", "drop", "n", "iterator", "", "take", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+@SourceDebugExtension({"SMAP\nSequences.kt\nKotlin\n*S Kotlin\n*F\n+ 1 Sequences.kt\nkotlin/sequences/SubSequence\n+ 2 fake.kt\nkotlin/jvm/internal/FakeKt\n*L\n1#1,680:1\n1#2:681\n*E\n"})
+/* loaded from: classes3.dex */
+public final class SubSequence<T> implements Sequence<T>, DropTakeSequence<T> {
+    private final int endIndex;
+    private final Sequence<T> sequence;
+    private final int startIndex;
+
+    /* JADX WARN: Multi-variable type inference failed */
+    public SubSequence(Sequence<? extends T> sequence, int i, int i4) {
+        Intrinsics.checkNotNullParameter(sequence, "sequence");
+        this.sequence = sequence;
+        this.startIndex = i;
+        this.endIndex = i4;
+        if (i < 0) {
+            throw new IllegalArgumentException(a.l(i, "startIndex should be non-negative, but is ").toString());
+        }
+        if (i4 < 0) {
+            throw new IllegalArgumentException(a.l(i4, "endIndex should be non-negative, but is ").toString());
+        }
+        if (i4 < i) {
+            throw new IllegalArgumentException(w.k("endIndex should be not less than startIndex, but was ", i4, i, " < ").toString());
+        }
+    }
+
+    private final int getCount() {
+        return this.endIndex - this.startIndex;
+    }
+
+    @Override // kotlin.sequences.DropTakeSequence
+    public Sequence<T> drop(int n4) {
+        return n4 >= getCount() ? SequencesKt__SequencesKt.emptySequence() : new SubSequence(this.sequence, this.startIndex + n4, this.endIndex);
+    }
+
+    @Override // kotlin.sequences.Sequence
+    public Iterator<T> iterator() {
+        return new SubSequence$iterator$1(this);
+    }
+
+    @Override // kotlin.sequences.DropTakeSequence
+    public Sequence<T> take(int n4) {
+        if (n4 >= getCount()) {
+            return this;
+        }
+        Sequence<T> sequence = this.sequence;
+        int i = this.startIndex;
+        return new SubSequence(sequence, i, n4 + i);
+    }
+}