At current time, these APIs are available only to selected Meta partners, if you are one of their Partners you can request those permissions from the key account manager, you are communicating with.
WhatsApp Business App
WhatsApp Business is free to download and was built with the small business owner in mind. The app makes it easy to personally connect with your customers, highlight your products and services, and answer their questions throughout their shopping experience. Create a catalog to showcase your products and services and use special tools to automate, sort and quickly respond to messages.
WhatsApp can also help medium and large businesses provide customer support and deliver important notifications to customers.
