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

)
[401] Error connecting to the API (https://api.cybersource.com/reporting/v3/purchase-refund-details?startTime=2020-01-01T12%3A00%3A00Z&endTime=2020-01-30T12%3A00%3A00Z&organizationId=testrest&paymentSubtype=VI&viewBy=requestDate&groupName=groupName&offset=20&limit=2000)