Build An App That Checks The Online Status Of Selected Whatsapp Contacts

€ 250.00 — 750.00 EUR
I want to make a mobile application that checks the online status of selected whatsapp contacts, and notifies the user when the selected contact is online, i already have the design.

I think this is possible, because it already exists another app that uses the same information and it works at least for someone:

https://play.google.com/store/apps/details?id=com.peanutbutter.wastat&hl=de&gl=US

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