How to Get Notification When Someone is Online on Whatsapp (Whatsapp Online Tracker)
Install the WALog – Whatsapp Tracker app on your phone. Open it and enter the number of the person whose Whatsapp online notification you want to receive. Tap on the submit button to get notifications when they come online on WhatsApp.
Google Play Whatsapp Tracker Get Notification When Someone Get Notified When Someone Whats Tracker Alog Whatsapp Tracker
Source: india.com