This endpoint is used to register new WhatsApp message template.
Please note that special html entities should be unescaped.
WhatsApp Message Templates are message formats for common reusable messages a business may want to send.
Businesses must use Message Templates for sending notifications to customers.
Any message sent outside the 24h customer service window, needs to be a template message, to be delivered.
Advertising, marketing, or promotional messages are not permitted.