whatsapp interface for sending bulk messages ( 10,000 msg/day). and check if the mobile numbers recived my msg content, and the ability to reply back to the messages Sender/receiver ability.
I already work with some freelancer regarding whatsapp bulk interface, but as they said, whatsapp keep changing the api and we couldnt lunch the services we have. so have you ever developed such a interface? if u have any examples to show me.