Copyleaks V1 API has been deprectaed and will reach it's end of life on July 1st 2020.
See newer version documentation - Copyleaks V3 API.
You can always receive the informtion from your scan results again using the 'downloads' functions:
Get the text you submitted for a scan
Get the text of the of the specific result
Get the comparison report information between your submitted content and the specific result