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/collections/CollectionsKt.java

@@ -0,0 +1,55 @@
+package kotlin.collections;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import kotlin.Metadata;
+import kotlin.jvm.functions.Function1;
+import r3.C0579k;
+
+@Metadata(d1 = {"kotlin/collections/CollectionsKt__CollectionsJVMKt", "kotlin/collections/CollectionsKt__CollectionsKt", "kotlin/collections/CollectionsKt__IterablesKt", "kotlin/collections/CollectionsKt__IteratorsJVMKt", "kotlin/collections/CollectionsKt__IteratorsKt", "kotlin/collections/CollectionsKt__MutableCollectionsJVMKt", "kotlin/collections/CollectionsKt__MutableCollectionsKt", "kotlin/collections/CollectionsKt__ReversedViewsKt", "kotlin/collections/CollectionsKt___CollectionsJvmKt", "kotlin/collections/CollectionsKt___CollectionsKt"}, k = 4, mv = {1, 9, 0}, xi = 49)
+/* loaded from: classes3.dex */
+public final class CollectionsKt extends CollectionsKt___CollectionsKt {
+    private CollectionsKt() {
+    }
+
+    public static /* bridge */ /* synthetic */ void a(Collection collection, Iterable iterable) {
+        CollectionsKt__MutableCollectionsKt.addAll(collection, iterable);
+    }
+
+    public static /* bridge */ /* synthetic */ void c(List list, Object[] objArr) {
+        CollectionsKt__MutableCollectionsKt.addAll(list, objArr);
+    }
+
+    public static /* bridge */ /* synthetic */ int f(List list, C0579k c0579k) {
+        return CollectionsKt__CollectionsKt.binarySearch$default(list, c0579k, 0, 0, 6, (Object) null);
+    }
+
+    public static /* bridge */ /* synthetic */ int g(Iterable iterable) {
+        return CollectionsKt__IterablesKt.collectionSizeOrDefault(iterable, 10);
+    }
+
+    public static /* bridge */ /* synthetic */ List h(List list) {
+        return CollectionsKt___CollectionsKt.dropLast(list, 1);
+    }
+
+    public static /* bridge */ /* synthetic */ Object i(Collection collection) {
+        return CollectionsKt___CollectionsKt.first(collection);
+    }
+
+    public static /* bridge */ /* synthetic */ Appendable k(Iterable iterable, StringBuilder sb, String str, String str2, String str3, Function1 function1, int i) {
+        return CollectionsKt___CollectionsKt.joinTo$default(iterable, sb, str, str2, str3, 0, null, function1, i, null);
+    }
+
+    public static /* bridge */ /* synthetic */ String l(Iterable iterable, String str, String str2, String str3, Function1 function1, int i) {
+        return CollectionsKt___CollectionsKt.joinToString$default(iterable, str, str2, str3, 0, null, function1, i, null);
+    }
+
+    public static /* bridge */ /* synthetic */ void r(java.util.AbstractSet abstractSet, Function1 function1) {
+        CollectionsKt__MutableCollectionsKt.retainAll(abstractSet, function1);
+    }
+
+    public static /* bridge */ /* synthetic */ int[] s(ArrayList arrayList) {
+        return CollectionsKt___CollectionsKt.toIntArray(arrayList);
+    }
+}