get https://sandbox.datamotion.com/SMCApi/v3/content/messages//metadata
This method is used to retrieve metadata for a sent message, particularly tracking and security information.
A session key must be submitted via the X-Session-Key header.
The request body should be left empty.
The message ID of the message metadata you'd like to retrieve must be passed in the URL of this method.
A successful transaction will receive a 200 status code.