I have a WhatsApp bulk tool already available:
Features:
- Login system
- easily translatable (separate files)
- Send and receive message / image / video / audio
- Message logging (You can see if the user seen the message / image or not)
- WhatsApp account management's (add, edit, delete, import, export, login check, block check, manage profile picture)
- WhatsApp contacts management's (Add contacts to groups) (add, edit, delete, import, export, profile picture, last seen)
- WhatsApp automatic number creation tool (By country) (generates numbers and adds to contacts if valid)
- Dashboard of several statistics
- Bulker (queue messages / images / videos and send on timely interval) (ablity to put number prefix and suffle on each message)
* You can have individual chats with contacts
* All messages are sent with a timed rotation system (If a channel sends, it will be put last in the queue again)
Note: the application is buit with Php, Javascript (jQuery & Ajax) with a Bootstrap 3.0 design and using OOP programming *High quality*
Note: Up to 100.000 messages in 24 hours can be sent