post https://api.brevo.com/v3/whatsapp/sendMessage
This endpoint is used to send a WhatsApp message.
(The first message you send using the API must contain a Template ID. You must create a template on WhatsApp on the Brevo platform to fetch the Template ID.)
You can use this API for WhatsApp only if you have setup your WhatsApp account on Sendinblue platform. To setup your WhatsApp account, follow the steps in the guide below.