WhatsApp Business API is different from WhatsApp Business App.
WhatsApp Business API
The WhatsApp Business API is a solution for mid to large businesses that engage with their customers on a scale usually though a programmatic implementation and integration with other business systems. Business API is suitable if you
Send bulk notifications
Integrate with other business systems
Use automation/bots for handling conversations
Have customer care agents to support customers
WhatsApp Business App
WhatsApp Business App on iOS and Android is the perfect solution for home based and small business where a single business owner supports customers. You can't create chatbots or send automated notifications to customers using this.
We don't support this.