Delete a Folder

This method is used to delete a custom folder from a user’s account.
Only custom folders can be deleted from a user’s account.
When a folder that contains messages is deleted from the system,
the messages will be moved into the respective Inbox or Outbox parent folder automatically.
A session key must be submitted via the X-Session-Key header.
The request body should be left empty.
The response body will be empty.
The FolderID of the folder you'd like to delete must be passed in the URL of this method.
A successful transaction will receive a 200 status code.