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To develop a Java library where we can incorporate into our Java application for mass sending of WhatsApp message.
The library should be able to perform the following:
a) Connect & Authenticate to WhatsApp Server
b) Send message to WhatsApp Users
c) Receive message sent to the login account
d) Query the status of user whether they are WhatsApp user and/or online
e) Obtain delivery status of the sent message
f) Able to send large volume at high performance
Developer must provide a detail documentation on the design & how to use the library.