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 Data Explorer icon Data Explorer in the main menu.
Click on CODE tab in the right top corner.
Using the "Select code language" drop down on the right of this page, choose "Swagger".
Click the link to access the Swagger documentation.