Every single Topspin widget has a unique identifier code called a "Widget ID". Visit an existing widget in your account. The Widget ID will be evident in a few places. For instance, when viewing a widget in your account, the widget ID will actually be present in the URL you're viewing:
The Widget ID in this case is 141048.
For Email for Media widgets, the Widget ID can also be found twice in the widget's embed code:
See id="TSWidgetXXXXXX" below:
See email_for_media/XXXXXX below:
The Widget ID is 142799.