If you need the APK for a different reason (e.g., development, testing on an emulator), let me know and I can tailor the guide further.
I understand you're looking for a WhatsApp APK for Android version 2.3.6. However, I need to provide an important clarification: Whatsapp Apk Download For Android 2.3.6 Latest Version
Support for Android 2.3.6 ended on February 1, 2020. The "latest version" for such an old OS does not exist — newer WhatsApp versions require Android 4.1+ (Jelly Bean) or higher. If you need the APK for a different reason (e