The workspace ID is a combination based on your organisation and workspace names. For example, for an "acme" organisation with a "weather" workspace, the final URL might look something like:
To determine the final URL, you can find out how to get a workspace id, or follow these instructions:
Click the Library icon Library in the main menu.
Search for "HTTP API - Shell Script" item in the search bar and select the item.
Find in the Code Preview the Url on any of the POST methods of the sample.