This endpoint allows you to send an email using a predefined template. Templates can include variables that are replaced with actual values when the email is sent.
(Optional) To receive post-back notifications about the sent message as it is delivered or failed. When a message status changes (delivered, failed, etc.), a notification will be sent to this URL. See Postback Notifications for the payload format and field descriptions.
(Optional) The data that will be sent back on the post_back_url with the notification. This can be used as an identifier for the sent message if the client wants to track or correlate messages with their own system. See Postback Notifications for how it appears in the notification.