whats-app bulk message

This project received 3 bids from talented freelancers with an average bid price of $1283 USD.

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Project Budget
$750 - $1500 USD
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Project Description

Note: Budget is not a constraint. If you have done such a thing successfully before please contact me.

If you've develop this solution for someone, please quote a price. I'm looking for ready solution rather than developing it.
Your sample solution demo required.

Need to develop script to enable us to send bulk Whatsapp messages
1- send bulk messages to whatsapp contacts which 1+ million daily - sender should not get blocked.
2- ability to import/export bulk .txt contain mobile numbers
3- ability to filter active contact list with options ( no whatsapp- last seen )
4- ability to have language files to add more then 1 Lang
5- ability to add/remove mobile numbers / IMEI , to send messages from
6- ability to customize send messages and customize how much message to be sent hourly and which numbers used to send the message from .
7- ability to view recent activity and messages history
8- ability to have user sign up
9- ability to add administrator / multi administrators .
10- ability to support the script for any updates later on which can be made from whatsapp end . ( will be paid when doing but it will be needed URGENT when needed )
11- ability to set number of message for each user to send
12- ability to set mobile number dedicated for user/s
13- ability to set mobile number for share users
14- ability to link it with online payment gateways such as ( paypal- 2checkout)
15- ability to make a full web design customization
16- secure the data .
17- ability to upgrade the script later on ( updates will be paid when doing )

Bidder must be able to prove previous experience of doing similar project. Otherwise, don't bid. Thanks.
Please note that the gateway is changed several times, so if you can do that and you can provide a proof/demo of the work then PM me.

I will only pay when i see a system operation .
Tests will be made because we had a lot of fraud offers before .

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