WhatsApp Business API is the ULTAMATE version of WhatsApp, which offers the most complete messaging service to address complicated usage from medium businesses and enterprises. For examples, Personal WhatsApp and WhatsApp Business are limited to send bulk messages to maximum 256 contacts at once, but now it can easily broadcast promotional messages to over 1000 contacts via API setting. Moreover, WhatsApp Business API unlocks additional functions such as green tick verification, multiple devices access, API automation trigger and third party integration. Simply speaking, WhatsApp Business API is able to overcomes all the limitations of other two, and we will explain further in following section.
Unlike Personal WhatsApp and WhatsApp Business, WhatsApp Business API is a paid service that you cannot register on you own, you must apply it through a WhatsApp API Partner in order to unleash all the potential of WhatsApp.