On internet there are many Bulk WhatsApp Sending Software available at one time cost and claim to provide unlimited sending capacity. But fact is even after sending few messages you will find your whatsapp number is BANNED. This is because technially its not possible to send bulk whatsapp via single number. Also whatsapp regularly update its applicatoin. And these software stop working after few days. So pratically they are useless for you.
Instead you should go for Credit based whatsapp marketing service. In that you don't need to install any software or worry about channel getting banned by whatsapp. As you upload thousands of numbers, online system will automatically start broadcasting your messages via multiple virtual whatsapp numbers integrated to our system. And hence you get high delivery without any headache or worry about whatsapp number getting banned.