WhatsApp is trying to register and send messages I've tested. But WhatsApp instantly blocks connections.
chat-api and examples by https://github.com/mgp25/Chat-API/tree/master/examples
composer install
- Requires: Chat-API
cd tools
php registerTool.php
After recording the user name and password. Change example/example.php
$username = "XXXXX";
$password = "XXXXX";
$nickname = "XXXX";
$target = "XXXX";
And
php example.php
According to the company:
“WhatsApp Messenger is a cross-platform mobile messenger that replaces SMS and works through the existing internet data plan of your device. WhatsApp is available for iPhone, BlackBerry, Android, Windows Phone, Nokia Symbian60 & S40 phones. Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.”
Jan. 2015: 30 billion messages per day, ~700 million users.
As of November 1, 2015 Chat API is licensed under the GPLv3+: http://www.gnu.org/licenses/gpl-3.0.html.