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/e3/z.java

@@ -0,0 +1,67 @@
+package e3;
+
+import java.util.ArrayList;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.text.StringsKt__StringsJVMKt;
+import kotlin.text.Typography;
+
+/* loaded from: classes3.dex */
+public abstract class z {
+    public static A a(String str) {
+        boolean startsWith$default;
+        boolean endsWith$default;
+        Intrinsics.checkNotNullParameter(str, "<this>");
+        Matcher matcher = A.f6197d.matcher(str);
+        if (!matcher.lookingAt()) {
+            throw new IllegalArgumentException(("No subtype found for: \"" + str + Typography.quote).toString());
+        }
+        String group = matcher.group(1);
+        Intrinsics.checkNotNullExpressionValue(group, "typeSubtype.group(1)");
+        Locale US = Locale.US;
+        Intrinsics.checkNotNullExpressionValue(US, "US");
+        String lowerCase = group.toLowerCase(US);
+        Intrinsics.checkNotNullExpressionValue(lowerCase, "this as java.lang.String).toLowerCase(locale)");
+        String group2 = matcher.group(2);
+        Intrinsics.checkNotNullExpressionValue(group2, "typeSubtype.group(2)");
+        Intrinsics.checkNotNullExpressionValue(US, "US");
+        Intrinsics.checkNotNullExpressionValue(group2.toLowerCase(US), "this as java.lang.String).toLowerCase(locale)");
+        ArrayList arrayList = new ArrayList();
+        Matcher matcher2 = A.f6198e.matcher(str);
+        int end = matcher.end();
+        while (end < str.length()) {
+            matcher2.region(end, str.length());
+            if (!matcher2.lookingAt()) {
+                StringBuilder sb = new StringBuilder("Parameter is not formatted correctly: \"");
+                String substring = str.substring(end);
+                Intrinsics.checkNotNullExpressionValue(substring, "this as java.lang.String).substring(startIndex)");
+                sb.append(substring);
+                sb.append("\" for: \"");
+                throw new IllegalArgumentException(com.google.android.gms.measurement.internal.a.n(sb, str, Typography.quote).toString());
+            }
+            String group3 = matcher2.group(1);
+            if (group3 == null) {
+                end = matcher2.end();
+            } else {
+                String group4 = matcher2.group(2);
+                if (group4 == null) {
+                    group4 = matcher2.group(3);
+                } else {
+                    startsWith$default = StringsKt__StringsJVMKt.startsWith$default(group4, "'", false, 2, null);
+                    if (startsWith$default) {
+                        endsWith$default = StringsKt__StringsJVMKt.endsWith$default(group4, "'", false, 2, null);
+                        if (endsWith$default && group4.length() > 2) {
+                            group4 = group4.substring(1, group4.length() - 1);
+                            Intrinsics.checkNotNullExpressionValue(group4, "this as java.lang.String…ing(startIndex, endIndex)");
+                        }
+                    }
+                }
+                arrayList.add(group3);
+                arrayList.add(group4);
+                end = matcher2.end();
+            }
+        }
+        return new A(str, lowerCase, (String[]) arrayList.toArray(new String[0]));
+    }
+}