If the copied URL is, for example, https://mingle-ionapi.eu1.inforcloudsuite.com/TENANT_PRD/IONSERVICES/datacatalog, append /v1/document/json to this URL.
In this case, the result should be https://mingle-ionapi.eu1.inforcloudsuite.com/TENANT_PRD/IONSERVICES/datacatalog/v1/document/json.