We need PHP code that sends simple text messages in whatsapp

We saw several APIs available. But, did not worked on our server. But we got success to grab the password for our phone-number (which is username in terms of whats app). Now, we need someone who can create a simple php script which is able to send single message to any whats app number using our username and password. Later we will use this simple PHP script in our project to send messages in a proper way to notify users for their activities and not to spam them.