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/text/StringsKt.java

@@ -0,0 +1,63 @@
+package kotlin.text;
+
+import java.util.List;
+import kotlin.Metadata;
+
+@Metadata(d1 = {"kotlin/text/StringsKt__AppendableKt", "kotlin/text/StringsKt__IndentKt", "kotlin/text/StringsKt__RegexExtensionsJVMKt", "kotlin/text/StringsKt__RegexExtensionsKt", "kotlin/text/StringsKt__StringBuilderJVMKt", "kotlin/text/StringsKt__StringBuilderKt", "kotlin/text/StringsKt__StringNumberConversionsJVMKt", "kotlin/text/StringsKt__StringNumberConversionsKt", "kotlin/text/StringsKt__StringsJVMKt", "kotlin/text/StringsKt__StringsKt", "kotlin/text/StringsKt___StringsJvmKt", "kotlin/text/StringsKt___StringsKt"}, k = 4, mv = {1, 9, 0}, xi = 49)
+/* loaded from: classes3.dex */
+public final class StringsKt extends StringsKt___StringsKt {
+    private StringsKt() {
+    }
+
+    public static /* bridge */ /* synthetic */ boolean D(String str, String str2) {
+        return StringsKt__StringsJVMKt.startsWith$default(str, str2, false, 2, null);
+    }
+
+    public static /* bridge */ /* synthetic */ CharSequence P(String str) {
+        return StringsKt__StringsKt.trim((CharSequence) str);
+    }
+
+    public static /* bridge */ /* synthetic */ void a(StringBuilder sb, String... strArr) {
+        StringsKt__StringBuilderKt.append(sb, strArr);
+    }
+
+    public static /* bridge */ /* synthetic */ boolean d(CharSequence charSequence, char c4) {
+        return StringsKt__StringsKt.contains$default(charSequence, c4, false, 2, (Object) null);
+    }
+
+    public static /* bridge */ /* synthetic */ boolean e(CharSequence charSequence, String str) {
+        return StringsKt__StringsKt.contains$default(charSequence, (CharSequence) str, false, 2, (Object) null);
+    }
+
+    public static /* bridge */ /* synthetic */ boolean i(String str, String str2) {
+        return StringsKt__StringsJVMKt.endsWith$default(str, str2, false, 2, null);
+    }
+
+    public static /* bridge */ /* synthetic */ boolean j(String str, String str2) {
+        return StringsKt__StringsJVMKt.equals(str, str2, true);
+    }
+
+    public static /* bridge */ /* synthetic */ int l(CharSequence charSequence, char c4, int i, int i4) {
+        return StringsKt__StringsKt.indexOf$default(charSequence, c4, i, false, i4, (Object) null);
+    }
+
+    public static /* bridge */ /* synthetic */ String s(String str, String str2) {
+        return StringsKt__StringsKt.removePrefix(str, (CharSequence) str2);
+    }
+
+    public static /* bridge */ /* synthetic */ String t(String str, String str2) {
+        return StringsKt__StringsKt.removeSuffix(str, (CharSequence) str2);
+    }
+
+    public static /* bridge */ /* synthetic */ String w(String str, String str2, String str3) {
+        return StringsKt__StringsJVMKt.replace$default(str, str2, str3, false, 4, (Object) null);
+    }
+
+    public static /* bridge */ /* synthetic */ List x(CharSequence charSequence, String[] strArr, int i, int i4) {
+        return StringsKt__StringsKt.split$default(charSequence, strArr, false, i, i4, (Object) null);
+    }
+
+    public static /* bridge */ /* synthetic */ List y(String str, char[] cArr) {
+        return StringsKt__StringsKt.split$default((CharSequence) str, cArr, false, 0, 6, (Object) null);
+    }
+}