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/NumbersKt__BigDecimalsKt.java

@@ -0,0 +1,138 @@
+package kotlin;
+
+import java.math.BigDecimal;
+import java.math.MathContext;
+import java.math.RoundingMode;
+import kotlin.internal.InlineOnly;
+import kotlin.jvm.internal.Intrinsics;
+
+@Metadata(d1 = {"\u0000$\n\u0000\n\u0002\u0018\u0002\n\u0002\b\b\n\u0002\u0010\u0006\n\u0000\n\u0002\u0018\u0002\n\u0002\u0010\u0007\n\u0002\u0010\b\n\u0002\u0010\t\n\u0002\b\u0002\u001a\r\u0010\u0000\u001a\u00020\u0001*\u00020\u0001H\u0087\n\u001a\u0015\u0010\u0002\u001a\u00020\u0001*\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\n\u001a\r\u0010\u0004\u001a\u00020\u0001*\u00020\u0001H\u0087\n\u001a\u0015\u0010\u0005\u001a\u00020\u0001*\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\n\u001a\u0015\u0010\u0006\u001a\u00020\u0001*\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\n\u001a\u0015\u0010\u0007\u001a\u00020\u0001*\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\n\u001a\u0015\u0010\b\u001a\u00020\u0001*\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\n\u001a\r\u0010\t\u001a\u00020\u0001*\u00020\nH\u0087\b\u001a\u0015\u0010\t\u001a\u00020\u0001*\u00020\n2\u0006\u0010\u000b\u001a\u00020\fH\u0087\b\u001a\r\u0010\t\u001a\u00020\u0001*\u00020\rH\u0087\b\u001a\u0015\u0010\t\u001a\u00020\u0001*\u00020\r2\u0006\u0010\u000b\u001a\u00020\fH\u0087\b\u001a\r\u0010\t\u001a\u00020\u0001*\u00020\u000eH\u0087\b\u001a\u0015\u0010\t\u001a\u00020\u0001*\u00020\u000e2\u0006\u0010\u000b\u001a\u00020\fH\u0087\b\u001a\r\u0010\t\u001a\u00020\u0001*\u00020\u000fH\u0087\b\u001a\u0015\u0010\t\u001a\u00020\u0001*\u00020\u000f2\u0006\u0010\u000b\u001a\u00020\fH\u0087\b\u001a\r\u0010\u0010\u001a\u00020\u0001*\u00020\u0001H\u0087\n¨\u0006\u0011"}, d2 = {"dec", "Ljava/math/BigDecimal;", "div", "other", "inc", "minus", "plus", "rem", "times", "toBigDecimal", "", "mathContext", "Ljava/math/MathContext;", "", "", "", "unaryMinus", "kotlin-stdlib"}, k = 5, mv = {1, 9, 0}, xi = 49, xs = "kotlin/NumbersKt")
+/* loaded from: classes3.dex */
+class NumbersKt__BigDecimalsKt {
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal dec(BigDecimal bigDecimal) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        BigDecimal subtract = bigDecimal.subtract(BigDecimal.ONE);
+        Intrinsics.checkNotNullExpressionValue(subtract, "subtract(...)");
+        return subtract;
+    }
+
+    @InlineOnly
+    private static final BigDecimal div(BigDecimal bigDecimal, BigDecimal other) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        Intrinsics.checkNotNullParameter(other, "other");
+        BigDecimal divide = bigDecimal.divide(other, RoundingMode.HALF_EVEN);
+        Intrinsics.checkNotNullExpressionValue(divide, "divide(...)");
+        return divide;
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal inc(BigDecimal bigDecimal) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        BigDecimal add = bigDecimal.add(BigDecimal.ONE);
+        Intrinsics.checkNotNullExpressionValue(add, "add(...)");
+        return add;
+    }
+
+    @InlineOnly
+    private static final BigDecimal minus(BigDecimal bigDecimal, BigDecimal other) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        Intrinsics.checkNotNullParameter(other, "other");
+        BigDecimal subtract = bigDecimal.subtract(other);
+        Intrinsics.checkNotNullExpressionValue(subtract, "subtract(...)");
+        return subtract;
+    }
+
+    @InlineOnly
+    private static final BigDecimal plus(BigDecimal bigDecimal, BigDecimal other) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        Intrinsics.checkNotNullParameter(other, "other");
+        BigDecimal add = bigDecimal.add(other);
+        Intrinsics.checkNotNullExpressionValue(add, "add(...)");
+        return add;
+    }
+
+    @InlineOnly
+    private static final BigDecimal rem(BigDecimal bigDecimal, BigDecimal other) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        Intrinsics.checkNotNullParameter(other, "other");
+        BigDecimal remainder = bigDecimal.remainder(other);
+        Intrinsics.checkNotNullExpressionValue(remainder, "remainder(...)");
+        return remainder;
+    }
+
+    @InlineOnly
+    private static final BigDecimal times(BigDecimal bigDecimal, BigDecimal other) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        Intrinsics.checkNotNullParameter(other, "other");
+        BigDecimal multiply = bigDecimal.multiply(other);
+        Intrinsics.checkNotNullExpressionValue(multiply, "multiply(...)");
+        return multiply;
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(int i) {
+        BigDecimal valueOf = BigDecimal.valueOf(i);
+        Intrinsics.checkNotNullExpressionValue(valueOf, "valueOf(...)");
+        return valueOf;
+    }
+
+    @InlineOnly
+    private static final BigDecimal unaryMinus(BigDecimal bigDecimal) {
+        Intrinsics.checkNotNullParameter(bigDecimal, "<this>");
+        BigDecimal negate = bigDecimal.negate();
+        Intrinsics.checkNotNullExpressionValue(negate, "negate(...)");
+        return negate;
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(int i, MathContext mathContext) {
+        Intrinsics.checkNotNullParameter(mathContext, "mathContext");
+        return new BigDecimal(i, mathContext);
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(long j4) {
+        BigDecimal valueOf = BigDecimal.valueOf(j4);
+        Intrinsics.checkNotNullExpressionValue(valueOf, "valueOf(...)");
+        return valueOf;
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(long j4, MathContext mathContext) {
+        Intrinsics.checkNotNullParameter(mathContext, "mathContext");
+        return new BigDecimal(j4, mathContext);
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(float f2) {
+        return new BigDecimal(String.valueOf(f2));
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(float f2, MathContext mathContext) {
+        Intrinsics.checkNotNullParameter(mathContext, "mathContext");
+        return new BigDecimal(String.valueOf(f2), mathContext);
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(double d4) {
+        return new BigDecimal(String.valueOf(d4));
+    }
+
+    @SinceKotlin(version = "1.2")
+    @InlineOnly
+    private static final BigDecimal toBigDecimal(double d4, MathContext mathContext) {
+        Intrinsics.checkNotNullParameter(mathContext, "mathContext");
+        return new BigDecimal(String.valueOf(d4), mathContext);
+    }
+}