get
https://sandbox.datamotion.com/SecureMessagingApi/Message//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.
The X-Session-Key header is missing. || Bad session key. || Session key expired. || Could not parse the message ID into an integer. || You do not have access to message with id [MessageId]. || The message has been deleted from the Inbox and is no longer available. || This message has been deleted from Track Sent and is no longer available.