Hello,
I have web api development experience. Since your project description seems it should use WhatsApp API to know whether any number is using WhatsApp or not or active or inactive.
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4 freelancers estão ofertando em média ₹3.694 INR for esse trabalho
I am an Android Developer Having 3 Years of Experience .. I Developed 80+ Mobile Apps. I can write same app as your requirements are.. please msg me if you need High Quality App