post https://api.dengage.com/rest/transactional/whatsapp
SendTransactionalWhatsapp function sends transactional whatsapp messages to recipients.
You shall use your own partnerId (you should get it from dEngage Panel > Instant Message Partner Details page) and payload to send messages.
Payload is a dynamic object. So you can change it's content by your self.
One important thing is you can only send single recipient with single message.