Unable to access lighroom auto tone API after providing correct credentials.

{"error_code":"403003","message":"Api Key is invalid"} <-- error  ,    Unable to access lighroom auto tone API using python code even after providing correct credentials. refrence for the result expected is mentioned in the url(https://www.adobe.io/apis/creativecloud/photo-imaging-api/api-demo.html.),

it is giving the same error  even when the API is called via Curl .