DownloadReport Sample Code is Running...
stdClass Object
(
    [response] => stdClass Object
        (
            [rmsg] => Authentication Failed
        )

)
[401] Error connecting to the API (https://api.cybersource.com/reporting/v3/report-downloads?organizationId=testrest&reportDate=2020-07-05&reportName=testrest_subcription_v2989)