Accessing CDISC Library API without an API key will result in HTTP 401 (Access Denied). A message similar to the following will appear in the response payload:
As of 2020-11-11, API access to CDISC Library requires an API key. Previous Basic Auth is no longer supported. Follow these instructions to obtain and test with an API key.
Please contact the CDISC Library Support (mailto:email@example.com) when you need assistance.