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.