Whatsapp marketing is becoming quite trendy now-a-days. You can engage customers easily through direct messaging and now you can track the analytics too with the third-party service providers. If you have your own API, you can use the Private ESP to send Whatsapp campaigns.
Private ESP acts as a proxy between the NotifyVisitors and actual service providers. In order to send and track the WhatsApp campaign analytics, you can integrate NotifyVisitors with Private ESP.