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/i3/c.java

@@ -0,0 +1,88 @@
+package i3;
+
+import java.io.IOException;
+import java.net.ProtocolException;
+import kotlin.jvm.internal.Intrinsics;
+import r3.C0576h;
+import r3.G;
+
+/* loaded from: classes3.dex */
+public final class c extends r3.o {
+
+    /* renamed from: b, reason: collision with root package name */
+    public final long f6831b;
+
+    /* renamed from: c, reason: collision with root package name */
+    public boolean f6832c;
+
+    /* renamed from: d, reason: collision with root package name */
+    public long f6833d;
+
+    /* renamed from: e, reason: collision with root package name */
+    public boolean f6834e;
+
+    /* renamed from: f, reason: collision with root package name */
+    public final /* synthetic */ e f6835f;
+
+    /* JADX WARN: 'super' call moved to the top of the method (can break code semantics) */
+    public c(e eVar, G delegate, long j4) {
+        super(delegate);
+        Intrinsics.checkNotNullParameter(delegate, "delegate");
+        this.f6835f = eVar;
+        this.f6831b = j4;
+    }
+
+    @Override // r3.o, r3.G, java.io.Closeable, java.lang.AutoCloseable
+    public final void close() {
+        if (this.f6834e) {
+            return;
+        }
+        this.f6834e = true;
+        long j4 = this.f6831b;
+        if (j4 != -1 && this.f6833d != j4) {
+            throw new ProtocolException("unexpected end of stream");
+        }
+        try {
+            super.close();
+            d(null);
+        } catch (IOException e4) {
+            throw d(e4);
+        }
+    }
+
+    public final IOException d(IOException iOException) {
+        if (this.f6832c) {
+            return iOException;
+        }
+        this.f6832c = true;
+        return this.f6835f.a(false, true, iOException);
+    }
+
+    @Override // r3.o, r3.G, java.io.Flushable
+    public final void flush() {
+        try {
+            super.flush();
+        } catch (IOException e4) {
+            throw d(e4);
+        }
+    }
+
+    @Override // r3.o, r3.G
+    public final void z(C0576h source, long j4) {
+        Intrinsics.checkNotNullParameter(source, "source");
+        if (this.f6834e) {
+            throw new IllegalStateException("closed");
+        }
+        long j5 = this.f6831b;
+        if (j5 == -1 || this.f6833d + j4 <= j5) {
+            try {
+                super.z(source, j4);
+                this.f6833d += j4;
+                return;
+            } catch (IOException e4) {
+                throw d(e4);
+            }
+        }
+        throw new ProtocolException("expected " + j5 + " bytes but received " + (this.f6833d + j4));
+    }
+}